[ewg] RE: SDP / TCP_NODELAY
Hi, SDP does not keep packet size statistics, but could if people want. Active connection info can be found in /proc/net/sdp, and the counters (and parameters) we do keep are in /sys/module/ib_sdp. There are a couple debug options that can be enabled. If you want to see per-frame detail, then you need to build with CONFIG_INFINIBAND_SDP_DEBUG_DATA defined and enable with /sys/module/ib_sdp//data_debug_leve=1. Then run something small and use dmesg to get the details. You can also enable some debug info on the normal build by setting debug_level=1 in the /sys/module/ib_sdp tree. Thanks, JIm Jim Mott Mellanox Technologies Ltd. mail: [EMAIL PROTECTED] Phone: 512-294-5481 -Original Message- From: Or Gerlitz [mailto:[EMAIL PROTECTED] Sent: Wednesday, November 21, 2007 7:05 AM To: Jim Mott Cc: EWG Subject: Re: SDP / TCP_NODELAY Jim Mott wrote: > SDP includes support for TCP_NODELAY and TCP_CORK. At a high level, > these options control buffering and they seem to be working. If you > turn off the nagle buffering algorithm using these options, then sends > go right away. This is how TCP_RR testing with netperf run to measure > latency. > > That is my understanding anyway. If you have some code that does not > seem to be running right, send it along and I will take a look. OK, thanks for the info, I will check to see if they still suspect that the NO_DELAY does not function as it should and let you know. Is there a way to see packet size statistics for SDP without an IB analyzer, do you expose some sysfs based statistics etc? Or. ___ ewg mailing list ewg@lists.openfabrics.org http://lists.openfabrics.org/cgi-bin/mailman/listinfo/ewg
[ewg] Re: SDP / TCP_NODELAY
Jim Mott wrote: SDP includes support for TCP_NODELAY and TCP_CORK. At a high level, these options control buffering and they seem to be working. If you turn off the nagle buffering algorithm using these options, then sends go right away. This is how TCP_RR testing with netperf run to measure latency. That is my understanding anyway. If you have some code that does not seem to be running right, send it along and I will take a look. OK, thanks for the info, I will check to see if they still suspect that the NO_DELAY does not function as it should and let you know. Is there a way to see packet size statistics for SDP without an IB analyzer, do you expose some sysfs based statistics etc? Or. ___ ewg mailing list ewg@lists.openfabrics.org http://lists.openfabrics.org/cgi-bin/mailman/listinfo/ewg
[ewg] RE: SDP / TCP_NODELAY
Hi, SDP includes support for TCP_NODELAY and TCP_CORK. At a high level, these options control buffering and they seem to be working. If you turn off the nagle buffering algorithm using these options, then sends go right away. This is how TCP_RR testing with netperf run to measure latency. That is my understanding anyway. If you have some code that does not seem to be running right, send it along and I will take a look. Thanks, JIm Jim Mott Mellanox Technologies Ltd. mail: [EMAIL PROTECTED] Phone: 512-294-5481 -Original Message- From: Or Gerlitz [mailto:[EMAIL PROTECTED] Sent: Wednesday, November 21, 2007 3:07 AM To: Jim Mott Cc: EWG Subject: SDP / TCP_NODELAY Hi Jim, I was handed a benchmark results from which I suspected that the SDP code that was used might not respect the TCP_NODELAY option, so I wanted to clarify this with you. I think it was OFED 1.2 based. So is it supported in OFED 1.2? in OFED 1.3? thanks, Or. ___ ewg mailing list ewg@lists.openfabrics.org http://lists.openfabrics.org/cgi-bin/mailman/listinfo/ewg
