On 03/31/2011 05:11 AM, Evgeny_Schmeilin wrote:
Mike,
Thank you again for your response!
I didn't see any problem on iscsi layer but there is what I saw.
When I run with default queue size settings:
node.session.cmds_max = 128
node.session.queue_depth = 32
And trying to push to sg device more than or near 32 outstanding
commands I noticed the big delays for some IOs.
And when I set queue_depth to 128 I was able to push 90 outstanding
ios without any delays.
But when IO count that I pushed was again closed to 128 I started to
see reasonable delays.
What iscsi target is this with?
Do you have any idea why this happens. Is it can be somehow connected
to open iscsi driver. I believe the poblem is in midl layer
Can you send the /var/log/messages with libiscsi (turn on all libiscsi
debuggin) and iscsi_tcp debugging on?
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