Re: Unexcepted latency (order of 100-200 ms) with TCP (packet receive)

2007-05-09 Thread David Miller
From: "Ilpo_Järvinen" <[EMAIL PROTECTED]> Date: Mon, 7 May 2007 14:45:53 +0300 (EEST) > I found out this shows up when 900fd17dd01d2c99dfd1ec0b53a860894a2673ee is > included, kernels before that seem to work fine. The problem description > is in this same thread. I'm not going to repeat it here

Re: Unexcepted latency (order of 100-200 ms) with TCP (packet receive)

2007-05-07 Thread Ilpo Järvinen
On Fri, 27 Apr 2007, Ilpo Järvinen wrote: > > On Thu, 26 Apr 2007, Ilpo Järvinen wrote: > > > On Thu, 26 Apr 2007, Chuck Ebbert wrote: > > > > > > > > Try a different network adapter. > > > > > > Hmm, I thought I had already done this but I just noticed that it is so > > > that the adapter was s

Re: Unexcepted latency (order of 100-200 ms) with TCP (packet receive)

2007-04-27 Thread Ilpo Järvinen
On Fri, 27 Apr 2007, Bill Fink wrote: > On Thu, 26 Apr 2007, Ilpo Järvinen wrote: > > > On Thu, 26 Apr 2007, Chuck Ebbert wrote: > > > > > Ilpo Järvinen wrote: > > > > ...I'm unsure how to continue the investigation from this point onward > > > > and asking for ideas/suggestions or how to rule

Re: Unexcepted latency (order of 100-200 ms) with TCP (packet receive)

2007-04-27 Thread Bill Fink
On Thu, 26 Apr 2007, Ilpo Järvinen wrote: > On Thu, 26 Apr 2007, Chuck Ebbert wrote: > > > Ilpo Järvinen wrote: > > > ...I'm unsure how to continue the investigation from this point onward > > > and asking for ideas/suggestions or how to rule out more possibilities... > > > Or is there some kno

Re: Unexcepted latency (order of 100-200 ms) with TCP (packet receive)

2007-04-26 Thread Ilpo Järvinen
On Thu, 26 Apr 2007, Chuck Ebbert wrote: > Ilpo Järvinen wrote: > > ...I'm unsure how to continue the investigation from this point onward > > and asking for ideas/suggestions or how to rule out more possibilities... > > Or is there some knob which I don't know of that should be toggled or > >

Re: Unexcepted latency (order of 100-200 ms) with TCP (packet receive)

2007-04-26 Thread Ilpo Järvinen
On Thu, 26 Apr 2007, Rick Jones wrote: > Ilpo Järvinen wrote: > > > > ... > > Some time ago I noticed that with 2.6.18 I occassionally get latency > > spikes as long as 100-200ms in the TCP transfers between components > > (I describe later how TCP was tuned during these tests to avoid > > proble

Re: Unexcepted latency (order of 100-200 ms) with TCP (packet receive)

2007-04-26 Thread Rick Jones
Ilpo Järvinen wrote: Hi, ... Some time ago I noticed that with 2.6.18 I occassionally get latency spikes as long as 100-200ms in the TCP transfers between components (I describe later how TCP was tuned during these tests to avoid problems that occur with small segments). I started to investigate

Re: Unexcepted latency (order of 100-200 ms) with TCP (packet receive)

2007-04-26 Thread Chuck Ebbert
Ilpo Järvinen wrote: > ...I'm unsure how to continue the investigation from this point onward > and asking for ideas/suggestions or how to rule out more possibilities... > Or is there some knob which I don't know of that should be toggled or > something, is 2.6 network stack expected to behave t

Unexcepted latency (order of 100-200 ms) with TCP (packet receive)

2007-04-26 Thread Ilpo Järvinen
Hi, I've been trying to figure out unexcepted delay spikes that seem to occur for TCP flows with 2.6 (tested 2.6.18.8 + a punch of own modifications and also with 2.6.20.7 with a single additional changeset only that enables me to TCP's control initial window at will). I'll first describe the