Btrfs + luks cause serious CPU usage

I often tried to forget about this, but in a time I use a external disk with btrfs.
bus as soon as I mount the disk via luks mapper device, I get serious CPU usage by kthreads. It goes that far that even typing into pidgin gets lagged/delayed.
Does anybody else have this kind of issue? An internal disk has the verysame effect. Tested copies with these combinations: ext4→btrfs; btrfs→btrfs; btrfs→ext4
Thank you!
Appendix:
Phenom 9500 4x 2.2
8GB DDR2 SDRAM
so the system should be pretty much capable of anything :>
Last edited by drahnr (2011-06-29 11:01:43)

I use pretty much the same options as you:
$ grep backup /etc/fstab
/dev/mapper/backup /mnt/backup btrfs defaults,noauto 0 0
I use the standard kernel from testing which is 2.6.39 though I have not seen this behavior on any previous kernel either.
If you don't use an indexer and something like iotop shows no activity I'm not sure what to try next. If you have hourly backups in place how many snapshots are there present on the volume? Are they being rotated or just building up? Could btrfs be doing some sort of rebalance (seems unlikely on a single disk pool)? Probably not being much help sorry.

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-- Name : spDrsSummarizeSendHistory
-- Definition : SqlObjs
-- Scope : CAS_OR_PRIMARY_OR_SECONDARY
-- Object : P
-- Dependencies : <Detect>
-- Description : Summarize DrsSendHistory information into DrsSendHistorySummary
CREATE PROCEDURE spDrsSummarizeSendHistory
AS
BEGIN
SET NOCOUNT ON;
DECLARE @CurrentTime DateTime;
DECLARE @SiteCode nvarchar(3);
DECLARE @LastSummarizationTime DateTime;
DECLARE @NextSummarizationTime DateTime;
DECLARE @Interval INT; -- summarize interval in minutes
DECLARE @ReplicationID INT
DECLARE @iMaxID INT
DECLARE @iCurrentID INT
DECLARE @iBatchSize INT = 50
DECLARE @ReplicationPattern NVARCHAR(255)
DECLARE @TargetSite NVARCHAR(3);
DECLARE @TimeTable TABLE (TargetSite NVARCHAR(3), StartTime DATETIME, EndTime DATETIME, PRIMARY KEY (TargetSite, StartTime, EndTime))
DECLARE @TargetSites TABLE (SiteCode NVARCHAR(3) PRIMARY KEY)
DECLARE @ChildTargetSites TABLE (TargetSite NVARCHAR(3), LastSummarizationTime DATETIME, [Interval] INT, PRIMARY KEY (TargetSite))
DECLARE @ReplicationGroup TABLE (ID INT, ReplicationPattern NVARCHAR(255))
IF OBJECT_ID(N'TempDB..#DrsSendHistorySummary') IS NOT NULL
DROP TABLE #DrsSendHistorySummary
CREATE TABLE #DrsSendHistorySummary (ID BIGINT IDENTITY(1, 1) NOT NULL, SourceSite NVARCHAR(3), TargetSite NVARCHAR(3), ReplicationGroupID INT, SyncDataSize BIGINT, CompressedSize BIGINT, UnCompressedSize BIGINT, MessageCount INT, ChangeCount INT, SummarizationTime DATETIME, PRIMARY KEY (ID))
SET @CurrentTime = GETUTCDATE();
SET @SiteCode = dbo.fnGetSiteCode();
INSERT INTO @ReplicationGroup (ID, ReplicationPattern)
SELECT RD.ID, RD.ReplicationPattern
FROM ReplicationData RD
WHILE EXISTS (SELECT * FROM @ReplicationGroup)
BEGIN
SELECT TOP (1) @ReplicationID = ID, @ReplicationPattern = ReplicationPattern FROM @ReplicationGroup
TRUNCATE TABLE #DrsSendHistorySummary
IF (((@ReplicationPattern = N'global' OR @ReplicationPattern=N'site') AND dbo.fnIsPrimary() = 1)
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BEGIN -- when current site is child
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SET @Interval = ISNULL((SELECT VALUE FROM RCMSQLCONTROLPROPERTY SCP, RCMSQLCONTROL SC
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INSERT INTO @TargetSites (SiteCode)
SELECT DISTINCT SiteCode FROM DRS_MessageActivity_Send WHERE ReplicationID = @ReplicationID
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BEGIN
SET @NextSummarizationTime = DATEADD( minute, DATEDIFF(minute, 0, @LastSummarizationTime)/@Interval *@Interval + @Interval, 0);
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DELETE @TimeTable
WHILE (@CurrentTime >= @NextSummarizationTime )
BEGIN
INSERT INTO @TimeTable (TargetSite, StartTime, EndTime)
SELECT SiteCode, @LastSummarizationTime, @NextSummarizationTime FROM @TargetSites
SET @LastSummarizationTime = @NextSummarizationTime;
SET @NextSummarizationTime = DATEADD(mi, @Interval, @NextSummarizationTime );
END
INSERT INTO #DrsSendHistorySummary (SourceSite, TargetSite, ReplicationGroupID, SyncDataSize, CompressedSize, UnCompressedSize, MessageCount, ChangeCount, SummarizationTime)
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FROM DrsSendHistory D RIGHT JOIN @TimeTable T ON D.EndTime >= T.StartTime AND D.EndTime < T.EndTime AND ReplicationGroupID = @ReplicationID AND T.TargetSite = D.TargetSite
GROUP BY T.TargetSite, T.StartTime, T.EndTime;
END
END
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OR (@ReplicationPattern = N'global_proxy' AND dbo.fnIsPrimary() = 1))
BEGIN -- when current site is parent
DELETE @ChildTargetSites
INSERT INTO @ChildTargetSites(TargetSite, LastSummarizationTime, [Interval])
SELECT DISTINCT(DSH.SiteCode),
ISNULL(( SELECT MAX(SummarizationTime) FROM DrsSendHistorySummary WHERE SourceSite = @SiteCode AND ReplicationGroupID = @ReplicationID AND TargetSite=DSH.SiteCode),
(SELECT MIN(EndTime) FROM DrsSendHistory WHERE ReplicationGroupID = @ReplicationID) ) AS LastSummarizeTime,
ISNULL((SELECT VALUE FROM RCMSQLCONTROLPROPERTY SCP, RCMSQLCONTROL SC WHERE SCP.ControlID = SC.ID AND SCP.Name = N'Send History Summarize Interval' AND SC.TypeID = 3 and SC.SiteNumber = dbo.fnGetSiteNumberBySiteCode(DSH.SiteCode)), 15) AS Interval
FROM DRS_MessageActivity_Send DSH WHERE DSH.ReplicationID = @ReplicationID
GROUP BY DSH.SiteCode;
DELETE @TimeTable
WHILE EXISTS (SELECT * FROM @ChildTargetSites)
BEGIN
SELECT TOP (1) @TargetSite = TargetSite, @LastSummarizationTime = LastSummarizationTime, @Interval = Interval FROM @ChildTargetSites
SET @NextSummarizationTime = DATEADD( minute, DATEDIFF(minute, 0, @LastSummarizationTime)/@Interval *@Interval + @Interval, 0);
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WHILE (@CurrentTime >= @NextSummarizationTime )
BEGIN
INSERT INTO @TimeTable (TargetSite, StartTime, EndTime)
SELECT @TargetSite, @LastSummarizationTime, @NextSummarizationTime
SET @LastSummarizationTime = @NextSummarizationTime;
SET @NextSummarizationTime = DATEADD(mi, @Interval, @NextSummarizationTime );
END
DELETE @ChildTargetSites WHERE TargetSite = @TargetSite
END;
INSERT INTO #DrsSendHistorySummary (SourceSite, TargetSite, ReplicationGroupID, SyncDataSize, CompressedSize, UnCompressedSize, MessageCount, ChangeCount, SummarizationTime)
SELECT @SiteCode, T.TargetSite, @ReplicationID, SUM(ISNULL(D.SyncDataSize, 0)), SUM(ISNULL(D.CompressedSize, 0)), SUM(ISNULL(D.UnCompressedSize, 0)), SUM(ISNULL(D.MessageCount, 0)), SUM(ISNULL(D.ChangeCount, 0)), @NextSummarizationTime
FROM DrsSendHistory D RIGHT JOIN @TimeTable T ON D.EndTime >= T.StartTime AND D.EndTime < T.EndTime AND ReplicationGroupID = @ReplicationID AND T.TargetSite = D.TargetSite
GROUP BY T.TargetSite, T.StartTime, T.EndTime;
END;
SELECT @iMaxID = MAX(ID), @iCurrentID = 0 FROM #DrsSendHistorySummary
-- BATCH INSERT TO REAL TABLE
WHILE (@iCurrentID < @iMaxID)
BEGIN
INSERT INTO DrsSendHistorySummary (SourceSite, TargetSite, ReplicationGroupID, SyncDataSize, MessageCount, ChangeCount, SummarizationTime)
SELECT SourceSite, TargetSite, ReplicationGroupID, SyncDataSize, MessageCount, ChangeCount, SummarizationTime
FROM #DrsSendHistorySummary WHERE ID > @iCurrentID AND ID <= (@iCurrentID + @iBatchSize)
SET @iCurrentID = @iCurrentID + @iBatchSize
END
TRUNCATE TABLE #DrsSendHistorySummary
DELETE @ReplicationGroup WHERE ID = @ReplicationID
END
END
If anyone has any experience with this issue or anything similar and might be able to point me in the right direction, any responses would be greatly appreciated. Thanks for reading!

Normally, this summary job every few mins which only summarize last few mins sending history. If the job was not running for long time, the first time, this sproc will summarize a lot more data than normal. So it could fail which will make things worse and
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Umair Khan | http://blogs.technet.com/umairkhan
Hi Umair,
Thank you for the reply. My plan was to go ahead with your suggestions but what I tried first was to get my VM guy to give the SQL server access to more CPU resources. We had already configured it with what would have seemed to be plenty, as per Microsoft's
sizing requirements, but I figured it couldn't hurt to rule out - he gave the SQL server access to a huge portion of the host processing power and since then CPU usage on the server has NOT been an issue.
It would appear that the large amounts of secondary sites we have just simply put a lot of stress on the SQL server with out of the box replication settings. Since the entire VM host is for System Center only, and our other System Center servers are using
very little resources, this solution has ended up being valid.
Thanks again for everyone's help with this.

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Hi,
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displayed.
hth,
blemmo

Btrfs + luks cause serious CPU usage

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