Client Count vs. Performance
Hello everyone.
I'd like to know your experience regarding how client count affects performance.
What I have seen in a university network, with a very high client densiity, using 3500 APs, is that around 55 clients ping reply time gets over 200 ms; around 60 users there's packet loss; then, as CC increases, somewhere between 60 - 70 the service gets totally lost. Off course, this depends on bandwidth consumption per user, interference, etc.
Also, I'd like to know what we could expect from 802.11ac regarding this topic. Is there any information on tests, or some estimation already published?
Thanks. And sorry if my enghlish is not good enough.
Julio,
Welcome to CSC.
I agree with Scotts statement. Although 802.11ac will allow clients transmissions to trigger at a faster PHY, it is still half duplex. Also, 802.11ac will need to be backward compatible to 802.11g and so on. Unless you have a full 802.1ac environment, your performance will suffer from backward compatibly support.
"Satisfaction does not come from knowing the solution, it comes from knowing why." - Rosalind Franklin
"I'm in a serious relationship with my Wi-Fi. You could say we have a connection."
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Cisco LWAP client count concentration
Hello
I have an environment of Cisco 5508 Wireless Controller and 1142N Access Points. I have a problem with the ratio of concentration of clients connecting to Access points in floors.
Recently I have been turning off 802.11a on the access points and I am seeing increase in client count in a few of acces points.
Here is the snapshot..
What is the maximum client count supported by these access points and how do i ensure they are distributed evenly on access points?
thanksCan you elaborate on your intentions again?
You are saying that you are shutting off A radios (5Ghz) and expecting to improve the performance of 2.4Ghz?
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I guess I'm just not following the logic of disabling 5Ghz radios....
If you're trying to improve performance, I'd chose Band Select over Load-Balancing, in an attempt to move clients over to 5Ghz. If your clients are only b/g/n (2.4Ghz) then thats a non issue, and load-balancing would distribute clients across the APs but it comes with an expense of potentially slower roams... -
Prime 2.1 - Client count report based on ssid
Dear All,
Is it possible to extract the reports of client count per ap based on ssid..?
Like, AP Name (eg., 2ndFloorAP) --> SSID (Test)--> Client count for past 1day, 1 week, 1 month etc.
As of now i could see overall client count of an ap from prime not based on SSID (under device work center --> unified ap --> client over time --> client count on ap / client traffic on ap)Hi Prasan,
Revisiting this issue, if you have your APs assigned to specific campus/building for your company, you can drill down to the specific AP and SSID that you want for that client count. The options that I used to run a report for one AP for one location that we have is as follows:
report title: <enter applicable name for report>
report by: AP by floor area
report criteria: choose edit and search for the location/building/campus and then the specific AP that you want from those fields. Then choose select.
Once back at the report screen you can set the next options:
connection protocol: select from drop down what you want if it is all clients, all wireless, etc.
The next drop down should allow you to select the specific SSID to what you want based upon the individual AP. Followed by the report time afterward. This report will output as a line graph showing the total number of clients based upon your search criteria and time frame. If you want to research client counts and see their mac address and IP ranges then you are limited to only seeing the current associated clients from the operation > work center flow while viewing the specific AP. Hope that helps.
Regards,
Brandon -
Cisco WCS client count report - client count figures cumulative or concurrent?
Hi,
Just want to clarify the "assoicated client count" and "Authenticated client count" values from WCS Client count report concurrent or cumculative?
The client count report in excel format:
Total Client Count
Total Count
Event Time
Associated Client Count
Authenticated Client Count
total
Sun Oct 12 23:59:59 HKT 2014
3992
3854
total
Mon Oct 13 23:59:59 HKT 2014
7838
7289
total
Tue Oct 14 23:59:59 HKT 2014
7724
7124
total
Wed Oct 15 23:59:59 HKT 2014
6849
6336
total
Thu Oct 16 23:59:59 HKT 2014
5908
5530
total
Fri Oct 17 23:59:59 HKT 2014
1240
1228
total
Sat Oct 18 23:59:59 HKT 2014
1040
1031
Client Count
AP Name
Base Radio MAC
Event Time
Associated Client Count
Authenticated Client Count
AP-EDHB-018
08:1f:f3:23:23:10
Mon Oct 13 23:59:59 HKT 2014
160
157
AP-EDHB-018
08:1f:f3:23:23:10
Tue Oct 14 23:59:59 HKT 2014
121
120
AP-EDHB-018
08:1f:f3:23:23:10
Wed Oct 15 23:59:59 HKT 2014
95
95
AP-EDHB-018
08:1f:f3:23:23:10
Thu Oct 16 23:59:59 HKT 2014
94
94
AP-EDHB-018
08:1f:f3:23:23:10
Fri Oct 17 23:59:59 HKT 2014
6
6
AP-EDHB-018
08:1f:f3:23:23:10
Sat Oct 18 23:59:59 HKT 2014
3
3
AP-EDHB-019
08:1f:f3:23:24:30
Sun Oct 12 23:59:59 HKT 2014
38
38
AP-EDHB-019
08:1f:f3:23:24:30
Mon Oct 13 23:59:59 HKT 2014
113
110
AP-EDHB-019
08:1f:f3:23:24:30
Tue Oct 14 23:59:59 HKT 2014
110
109
AP-EDHB-018 have 160 assoicated client count reported. Really mean there were 160 wireless client assoicated at a moment or there were a totally 160 connected at that day?
Any idea?
DickHi Kayle,
Thanks for the response. I think you are talking about this in the above.
Reports > Report Launch Pad > Client > Client Count > Client Count Report Details
then
AP by Floor Area and select "All Campus", "All Building", "All Floor"
By doing this I get 700+ APs daily client count in graphical (pdf) view and need to go through manually each graph to identify the top 50, top 100 in a given day.
Is it possible to only filter the top 50, 100 APs ?
I would like see my daily report gives something similar to the below
AP Name Max Client Count
AP01 96
AP02 83
AP50 20
Would it possible to get something like this from WCS reports ?
Thanks
Rasika -
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I have a large campus with a large number of odd shaped buildings for which we do not have accurate floorplans and we need to run historical reports for the client count per AP however as far as I can see this is not possible unless I create maps and floorplans of the site.
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Sent from Cisco Technical Support iPhone App -
RSSI, channel utilization, clients counts on APs
Hello Guy,
I have around 100 APs
some showing 100% channel utilization with only 2 or 3 Clients connected to it. why ?
Some APs showing 38 clients connected but channel utilization is 24 %. why ?
Some APs shows 0 value.
Can any one clerify RSSI, channel utilization, clients counts on APs
thanksOh that .. If you look at these aps they dont have clients. That 0 shows the worse clients that the aps hears. No clients .. means no clients to have a signal .. so its zero ..
Make sense?
"Satisfaction does not come from knowing the solution, it comes from knowing why." - Rosalind Franklin
"I'm in a serious relationship with my Wi-Fi. You could say we have a connection." -
Wired Client Count - Infrastructure 2.0
Hi all.
Im getting wired client count on the switche but im not getting the count on coverage area ect ...ive added the switches to location site. Anyone with the same issue ?
Im getting the total wired / wireless count in general view
I want a view with client count wired / wireless on location basic ( just like the Coverage view )
FilipHi Markus,
From my experience PI2.0 has very limited (basically none) custom reporting. The only customising you can do is with existing/preconfigured reports in terms of setting the dates, nr of devices reported on etc etc...
Lets see what the newer versions brings...
Ciao
JC -
How can we improve the perfromace of a count query?
Suppose I have a table A that holds more than 50 million rows.
Now if i want to count the no of rows which is the best one
1) Select count(*) from A.
Definitely not as it is doing a full table scan
2) Select count(primary_key) from A.
3) Select count(row_id) from A.
One more question whats the difference between select count(*) from table_name and select count(1) from table_a. Many people suggest count(1) and i dont see any reason though.
Kindly guide me.> Please see my points 1,2 and 3.
Can this change the execution plan (path) of the CBO in anyway?
1. count rows
2. count rows using primary key
3. counting rows using physical row addresses
The fact is that the rows, and all the rows, need to be counted. The CBO will choose the most "attractive" I/O path - i.e. the smallest one, the one with the least amount of I/O. It does not need tricks like COUNT(1) or COUNT(PK) or COUNT(ROWID) in order to make an appropriate decision.
Example:
SQL> create table tab1 nologging as select level as ID, LPAD('*',4000,'*') as STUFF from dual connect by level <= 10000;
Table created.
SQL> set autotrace on
Running a SELECT COUNT(*) without any alternate I/O paths (no indexes exist)
SQL> select count(*) from tab1;
COUNT(*)
10000
Execution Plan
Plan hash value: 899213575
| Id | Operation | Name | Rows | Cost (%CPU)| Time |
| 0 | SELECT STATEMENT | | 1 | 2306 (4)| 00:00:28 |
| 1 | SORT AGGREGATE | | 1 | | |
| 2 | TABLE ACCESS FULL| TAB1 | 9982 | 2306 (4)| 00:00:28 |
Note
- dynamic sampling used for this statement
Statistics
28 recursive calls
0 db block gets
10087 consistent gets
10000 physical reads
0 redo size
208 bytes sent via SQL*Net to client
238 bytes received via SQL*Net from client
2 SQL*Net roundtrips to/from client
0 sorts (memory)
0 sorts (disk)
1 rows processed
Creating an PK index
SQL> alter table tab1 add constraint pk_tab1 primary key(id) using index;
Table altered.
Running the same SELECT COUNT(*) - but the CBO now sees that the PK index
is smaller and cheaper to scan than scanning the table
SQL> select count(*) from tab1;
COUNT(*)
10000
Execution Plan
Plan hash value: 1796789124
| Id | Operation | Name | Rows | Cost (%CPU)| Time |
| 0 | SELECT STATEMENT | | 1 | 9 (23)| 00:00:01 |
| 1 | SORT AGGREGATE | | 1 | | |
| 2 | INDEX FAST FULL SCAN| PK_TAB1 | 9982 | 9 (23)| 00:00:01 |
Note
- dynamic sampling used for this statement
Statistics
194 recursive calls
0 db block gets
131 consistent gets
20 physical reads
0 redo size
222 bytes sent via SQL*Net to client
238 bytes received via SQL*Net from client
2 SQL*Net roundtrips to/from client
5 sorts (memory)
0 sorts (disk)
1 rows processed
SQL> -
Collection method COUNT and performance
Hi,
I use associative arrays in my application, this kind:
TYPE ADRESSETT IS TABLE OF mig.ADRESSE%ROWTYPE INDEX BY BINARY_INTEGER;
A good many times I need the count of elements in this arrays.
Of course I can use the COUNT method for this purpose.
However could it be faster to maintain a simple counter which is incremented and decremented on inserting/deleting elements
from the array?
How expensive is the COUNT method? Does the method really calculate the count every time new?
Thomasuser447000 wrote:
Hi,
I use associative arrays in my application, this kind:
TYPE ADRESSETT IS TABLE OF mig.ADRESSE%ROWTYPE INDEX BY BINARY_INTEGER;
A good many times I need the count of elements in this arrays.
Of course I can use the COUNT method for this purpose.
However could it be faster to maintain a simple counter which is incremented and decremented on inserting/deleting elements
from the array?
How expensive is the COUNT method? Does the method really calculate the count every time new?
ThomasIf you know anthing about arrays/collections/linked lists etc. (all the sort of stuff taught in the basics of programming in the first year of university), then you'll know that retrieving the count of the number of 'elements' in those things is part of what they are about. The count method doesn't have to 'calculate' the count every time, as it will be held in the collections internal structure and internally maintained every time something is added/deleted. It's not going to be an expensive operation to perform as it's just going to return the value of an internal value that is already known.
Of course, it's far easier to avoid collections altogether as they use expensive PGA memory, and instead process your data using SQL directly against the database tables. -
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WebOS IMAP client: No expunge performed
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Lyubov,
Thank you for your question.
I am trying to involve someone familiar with this topic to further look at this issue.
Thanks,
Simon
We
are trying to better understand customer views on social support experience, so your participation in this
interview project would be greatly appreciated if you have time.
Thanks for helping make community forums a great place. -
WCS report to get client count history
Hello! I've been poking around the Reports feature of our WCS Controller (version 7.0.164.0) and I'm trying to figure out how to get a history of the number associated clients on a particular AP over a specific date range. Is this possible? Thanks!
Christopher,
Check out this link: http://www.cisco.com/en/US/docs/wireless/wcs/7.0/configuration/guide/7_0reps.html#wp1135255
Try running the report called AP by Floor Area.
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Setting the Client Count per WLAN and per AP radio
Hi
We use WLC 5508 with 7.4. We tried to set max allowed clients per AP radio to 30 through GUI. We have APs with 80 clients associeted though.
Has anyone else tried this feature?
When entering config wlan max-associated-clients max-clients wlan-id we got
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Thanks
This is the show wlan outputNo, the GUI does some stuff automatically, like disablen/enabling the WLAN when you make the change.
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Please remember to rate useful posts, and mark questions as answered -
What does this metric in WCS tell us, exactly? I could not find an explenation in any of the guides.
This is found on the Radio Details - On Demand Statistics page of each WAP.I found this to be a good explanation of SNR Cutoff recommendations which this graph seems to relate to. Basically it tells you for the radio
what SNR the clients are reporting for that AP radio. This gives you an idea of the percentage of clients that are hearing it at a good level versus a bad level.
http://www.wi-fiplanet.com/tutorials/article.php/3468771
You may want to ask specific questions regarding power and design in a forum more related to that since I am answering this from the WCS side. -
Performance counter updating error
Hello,
We are getting flooded with alerts event code 106. Is there a problem with the counters. We also get these on our mailbox server also. The servers are exchange 2013 on prem. The we have 2 CAS and 4 mailbox servers.
Application:MSExchange Common:106
Performance counter updating error. Counter name is Client-side Calls, category name is MSExchange Active Manager Client. Option
Performance counter
updating error. Counter name is Unique servers queried, category name is MSExchange Active Manager Client. Optional code: 3. Exception: The exception thrown is : System.InvalidOperationException: The requested Performance Counter is no
Performance counter updating error. Counter name is Client-side Calls, category name is MSExchange Active Manager Client. Optional code: 2. Exception: The exception thrown is : System.InvalidOperationException:
The requested Performance Counter is not a custom counter, it has to be initialized as ReadOnly. at System.Diagnostics.PerformanceCounter.InitializeImpl() at System.Diagnostics.PerformanceCounter.get_RawValue() at Microsoft.Exchange.Diagnostics.ExPerformanceCounter.get_RawValue()
Last worker process info : System.ArgumentException: Process with an Id of 1832 is not running. at System.Diagnostics.Process.GetProcessById(Int32 processId) at Microsoft.Exchange.Diagnostics.ExPerformanceCounter.GetLastWorkerProcessInfo() Processes running
while Performance counter failed to update: 7020 splunk-perfmon 588 services 976 svchost 384 TrustedInstaller 1368 svchost 6620 rdpclip 1168 rundll32 1560 inetinfo 5300 XenDpriv 1160 svchost 2144 XenGuestAgent 2340 Microsoft.Exchange.Directory.TopologyService
8444 conhost 956 LogonUI 2528 w3wp 2724 WmiPrvSE 6884 explorer 5472 nvwmi64 544 winlogon 3104 w3wp 772 nvvsvc 3292 MSExchangeFrontendTransport 2108 WMSvc 7228 w3wp 332 smss 1312 spoolsv 3872 rundll32 4856 WmiApSrv 6704 w3wp 5444 winlogon 3864 svchost 1104
VSSVC 6404 ccSvcHst 10552 vds 504 csrss 5032 Smc 6804 dwm 696 svchost 496 wininit 4632 rundll32 888 svchost 6600 w3wp 492 w3wp 2264 Ec2Config 1672 MSExchangeHMHost 2064 svchost 9512 splunkd 7972 w3wp 1860 SMSvcHost 872 svchost 5792 csrss 5592 MSExchangeHMWorker
1452 ruby 1840 svchost 6764 w3wp 1048 svchost 456 csrss 7152 w3wp 1388 bedbg 3996 Microsoft.Exchange.UM.CallRouter 4380 splunk-wmi 2812 WmiPrvSE 2024 ccSvcHst 3792 Microsoft.Exchange.ServiceHost 600 lsass 796 nvwmi64 5756 w3wp 1580 msdtc 2796 svchost 428 svchost
820 nvSCPAPISvr 1016 svchost 1996 svchost 1600 Microsoft.Exchange.Diagnostics.Service 4356 nvxdsync 4352 taskeng 608 lsm 4936 svchost 2964 beremote 6312 taskhost 1976 svchost 4 System 10640 conhost 0 Idle Performance Counters Layout information: FileMappingNotFoundException
for category MSExchange Active Manager Client : Microsoft.Exchange.Diagnostics.FileMappingNotFoundException: Cound not open File mapping for name Global\netfxcustomperfcounters.1.0msexchange active manager client. Error Details: 2 at Microsoft.Exchange.Diagnostics.FileMapping.OpenFileMapping(String
name, Boolean writable) at Microsoft.Exchange.Diagnostics.PerformanceCounterMemoryMappedFile.Initialize(String fileMappingName, Boolean writable) at Microsoft.Exchange.Diagnostics.ExPerformanceCounter.GetAllInstancesLayout(String categoryName)Hi,
Please try the following steps:
1. Stop all the exchange-related services on the server
2. Open the command prompt by “Run as an Administrator”
3. Go to "C:\Program files\Microsoft\Exchange Server\V15\Setup\Perf"
4. To Unload Counter
===============
C:\Program files\Microsoft\Exchange Server\V15\Setup\Perf>unlodctr "MSExchaneg Active Manager Client"
5. To Load Counter
=============
C:\Program files\Microsoft\Exchange Server\V15\Setup\Perf>lodctr ActiveManagerClientPerfmon.ini
Then check whether the issue persists. The solution above is referred to the following similar thread:
https://social.technet.microsoft.com/Forums/exchange/en-US/58692b89-d83e-4f3a-b991-9bb38b8ccad0/performance-counters-update-errors-exchange-active-manager-client-ones?forum=exchange2010
Regards,
Please remember to mark the replies as answers if they help, and unmark the answers if they provide no help. If you have feedback for TechNet Support, contact [email protected]
Winnie Liang
TechNet Community Support
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