Jumbo Frame iSCSI

Question

I am using iSCSI for backup to disk. The target is SUSE 10 and initiator
is NW 6.5 sp7. The speed isn't so great, so I'm trying to make sure I've
got Jumbo frames setup properly. I've added the switch Jumbo=9000 to my
netinfo.cfg file, as per a post here by Massimo from 15-Aug-2007.
So the load network card line looks like this:
LOAD B57 NAME=B57_1_EII_EII FRAME=Ethernet_II SLOT=10019 Speed=AUTO
RxBuffers=200 Jumbo=9000
But when I look in Monitor > LAN/WAN Drivers the Jumbo Packet Size
(bytes) still reads 0. So, I don't think I'm getting Jumbo frames happening.
I've also set the following:
TCP delayed acknowledgement =on
tcp nagle algorithm=on
tcp minshall algorithm=on
set tcp maximum inital receive window = 64
and in startup.ncf
set maximum physical receive pacet size = 1800
Can anyone help me figure this out?
Thanks,
Doug

Answer 1

Massimo Rosen wrote:
> Hi,
>
> Doug wrote:
>> I am using iSCSI for backup to disk. The target is SUSE 10 and initiator
>> is NW 6.5 sp7. The speed isn't so great, so I'm trying to make sure I've
>> got Jumbo frames setup properly. I've added the switch Jumbo=9000 to my
>> netinfo.cfg file, as per a post here by Massimo from 15-Aug-2007.
>>
>> So the load network card line looks like this:
>>
>> LOAD B57 NAME=B57_1_EII_EII FRAME=Ethernet_II SLOT=10019 Speed=AUTO
>> RxBuffers=200 Jumbo=9000
>
> That looks good. Yre you sure this is the first load line for that nic?
>
>
>> Can anyone help me figure this out?
>
> Well, you already got the question about your switch, but what about the
> Target? Are you sure it can really do Jumbo Frames? If all else fails,
> take a lan trace of a tcp connection setup, and you wil see which frame
> size is advertised by each side.
>
> CU,
Yes the target is doing jumbo frames. I set the MTU to 9000, and the
Windows box saw a good improvement on speed.
Here's the netinfo.cfg file.
#!VERSION=2.3
#! --- WARNING -- WARNING -- WARNING -- WARNING -- WARNING -- WARNING ----
#! This file was created by the Internetworking Configuration Console.
#! It is intended to be modified ONLY by the configurator (INETCFG.NLM).
#! Tampering with this file may cause severe malfunctioning of the system.
#! The configurator will check for tampering and abort if it is detected.
#!SERVERTYPE=NORMAL
#!UIMODE=NORMAL
#!BEGINGENLOAD
LOAD SNMP
LOAD BCALLSRV
#!END
#!BEGINTSMLOAD
#!END
#!BEGINBOARD DRVR=B57 NAME=B57_2_EII STATUS=ENABLED NUMPORTS=1
DRVRTYPE=LAN VARIABLEPORTS=NO PORTPARAM=CHANNEL SLOT=10020 Speed=AUTO
RxBuffers=200
#!BEGINPORT NAME=B57_2_EII NUMBER=1 STATUS=ENABLED FRAMES=YES NUMLINKS=0
MEDIA=EtherTsm WANFRAME=UNCONFIGURED
#!REFCOUNT=1
LOAD B57 NAME=B57_2_EII_EII FRAME=Ethernet_II SLOT=10020 Speed=AUTO
RxBuffers=200 Jumbo=9000
#!END
#!END
#!BEGINBOARD DRVR=B57 NAME=B57_1_EII STATUS=ENABLED NUMPORTS=1
DRVRTYPE=LAN VARIABLEPORTS=NO PORTPARAM=CHANNEL SLOT=10019 Speed=AUTO
RxBuffers=200
#!BEGINPORT NAME=B57_1_EII NUMBER=1 STATUS=ENABLED FRAMES=YES NUMLINKS=0
MEDIA=EtherTsm WANFRAME=UNCONFIGURED
#!REFCOUNT=1
LOAD B57 NAME=B57_1_EII_EII FRAME=Ethernet_II SLOT=10019 Speed=AUTO
RxBuffers=200 Jumbo=9000
#!END
#!END
#!BEGINPROTO PROTO=TCPIP STATUS=ENABLED
LOAD Tcpip RIP=No Static=Yes LoadSharing=No Forward=No VIPASupport=No
#!BEGINBIND STATUS=ENABLED
BIND IP B57_2_EII_EII ADDRESS=xxx.xxx.xxx.xxx MASK=255.255.255.0
#xxx.xxx.xxx.xxx
#!END
#!BEGINBIND STATUS=ENABLED
BIND IP B57_1_EII_EII ADDRESS=xxx.xxx.xxx.xxx MASK=255.255.255.0
#xxx.xxx.xxx.xxx
#!END
#!END