On Thu, Nov 26, 2009 at 08:06:13AM +0100, Bart Van Assche wrote:
> On Wed, Nov 25, 2009 at 5:57 PM, Shachar f <shacharf...@gmail.com> wrote:
> > I'm running open-iscsi with scst on Broadcom 10Gig network and facing write
> > latency issues.
> > When using netperf over an idle network the latency for a single block round
> > trip transfer is 30 usec and with open-iscsi it is 90-100 usec.
> >
> > I see that Nagle (TCP_NODELAY) is disabled when openning socket on the
> > initiator side and I'm not sure about the target side.
> > Vlad, Can you elaborate on this?
> >
> > Are others in the mailing list aware to possible environment changes that
> > effext latency?
> >
> > more info -
> > I'm running this test with Centos5.3 machines with almost latest open-iscsi.
> Please make sure that interrupt coalescing has been disabled -- see
> also ethtool -c.

Did you ever figure out the problem for the additional latency? 

-- Pasi


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