Re: [Iscsitarget-devel] a question about max_cmd_sn

[Ross W. <rsw...@gm...>]

On Jun 29, 2010, at 11:17 AM, "spren" <sp...@16...> wrote:

>> Good observation, and yes, you are correct, the current behavior
>> gives a limitless command buffer, which can put memory pressure
>> on the kernel, but we usually see the pressure more on the disk
>> subsystem where frequent SCSI timeouts start occurring and then
>> frequent cmnd_aborts start occurring.
>> 
>> I have a fix for this, but it wasn't committed to 1.4 it will
>> most likely appear in 1.5 along with several other big fixes,
>> (proper tagged command queuing, PGRs, to name a few).
>> 
>> If you are experiencing these issues let me know and I can
>> provide a patch to test out to see if it fixes things for
>> you.
>> 
> Thanks for your reply. In fact we are experiencing OOM occasionally, but we are not sure 
> about the reason, because the system has other modules added in  recently which are not stable, 
> and when looking into the iet source i get the above question. we can wait for the next release:) Thanks again.

Is it kernel memory that is OOM or user?

-Ross