Re: [Scst-devel] iSCSI latency issue

2009-12-29 Thread Pasi Kärkkäinen
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

Re: iSCSI latency issue

2009-11-25 Thread Vladislav Bolkhovitin
Shachar f, on 11/25/2009 07:57 PM 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

iSCSI latency issue

2009-11-25 Thread Shachar f
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

Re: [Scst-devel] iSCSI latency issue

2009-11-25 Thread Bart Van Assche
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