Hi.
Panagiotis Christias wrote:
In the "good" case you are getting a much higher interrupt rate but
with the data you provided I can't tell where from. You need to run
vmstat -i at regular intervals (e.g. every 10 seconds for a minute)
during the "good" and "bad" times, since it only provides counters
and an average rate over the uptime of the system.
Now I'm running 10-process lighttpd and the problem became no so big.
I collected interrupt stats and it shows no relation beetween
ionterrupts and slowdowns. Here is it:
http://83.167.98.162/gprof/intr-graph/
Also I have similiar statistics on mutex profiling and it shows
there's no problem in mutexes.
http://83.167.98.162/gprof/mtx-graph/mtxgifnew/
I have no idea what else to check.
I don't know what this graph is showing me :) When precisely is the
system behaving poorly?
what is your RAID controller configuration (read ahead/cache/write
policy)? I have seen weird/bogus numbers (~100% busy) reported by
systat -v when read ahead was enabled on LSI/amr controllers.
**********************************************************************
Existing Logical Drive Information
By LSI Logic Corp.,USA
**********************************************************************
[Note: For SATA-2, 4 and 6 channel controllers, please specify
Ch=0 Id=0..15 for specifying physical drive(Ch=channel,
Id=Target)]
Logical Drive : 0( Adapter: 0 ): Status: OPTIMAL
---------------------------------------------------
SpanDepth :01 RaidLevel: 5 RdAhead : Adaptive Cache: DirectIo
StripSz :064KB Stripes : 6 WrPolicy: WriteBack
Logical Drive 0 : SpanLevel_0 Disks
Chnl Target StartBlock Blocks Physical Target Status
---- ------ ---------- ------ ----------------------
0 00 0x00000000 0x22ec0000 ONLINE
0 01 0x00000000 0x22ec0000 ONLINE
0 02 0x00000000 0x22ec0000 ONLINE
0 03 0x00000000 0x22ec0000 ONLINE
0 04 0x00000000 0x22ec0000 ONLINE
0 05 0x00000000 0x22ec0000 ONLINE
I tried to run with disabled Read-ahead, but it didn't help.
With best regards,
Alexey Popov
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