From: Mark_H_Johnson@raytheon.com
To: Ingo Molnar <mingo@elte.hu>
Cc: "K.R. Foley" <kr@cybsft.com>,
linux-kernel <linux-kernel@vger.kernel.org>,
Felipe Alfaro Solana <lkml@felipe-alfaro.com>,
Daniel Schmitt <pnambic@unu.nu>,
Lee Revell <rlrevell@joe-job.com>
Subject: Re: [patch] voluntary-preempt-2.6.9-rc1-bk4-Q5
Date: Tue, 31 Aug 2004 07:46:08 -0500 [thread overview]
Message-ID: <OF05BA5553.2755D604-ON86256F01.00456420@raytheon.com> (raw)
>in theory the patch is more or less equivalent to setting
>netdev_max_backlog to a value of 1 - could you try that setting too?
>(with the patch unapplied.)
Ugh. That setting is VERY BAD. Just a quick test without
doing anything complex...
# echo 1 > /proc/sys/net/core/netdev_max_backlog
# ping dws7
PING dws7 (192.52.215.17) 56(84) bytes of data.
[so the DNS lookup worked]
From dws77... (192.52.215.87) icmp_seq=0 Destination Host Unreachable
From dws77... (192.52.215.87) icmp_seq=1 Destination Host Unreachable
From dws77... (192.52.215.87) icmp_seq=2 Destination Host Unreachable
...
[NOTE - these are plugged into the same 10/100 Ethernet switch]
# echo 8 > /proc/sys/net/core/netdev_max_backlog
# ping dws7
PING dws7 (192.52.215.17) 56(84) bytes of data.
[so the DNS lookup worked]
From dws77... (192.52.215.87) icmp_seq=0 ttl=64 time=2210 ms
From dws77... (192.52.215.87) icmp_seq=1 ttl=64 time=1210 ms
From dws77... (192.52.215.87) icmp_seq=2 ttl=64 time=210 ms
From dws77... (192.52.215.87) icmp_seq=2 ttl=64 time=0.355 ms
From dws77... (192.52.215.87) icmp_seq=2 ttl=64 time=0.397 ms
...
I tried again with 2, 3, and 4. Two appears to be "way too small" with
a ping of 1000 ms and nominal values of 0.800 ms. Three does not appear
to be good either with nominal values of 0.500 ms. Four has similar
results to eight (8).
--Mark H Johnson
<mailto:Mark_H_Johnson@raytheon.com>
next reply other threads:[~2004-08-31 12:49 UTC|newest]
Thread overview: 57+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-08-31 12:46 Mark_H_Johnson [this message]
[not found] <OFD220F58F.002C5901-ON86256F02.005C2FB1-86256F02.005C2FD5@raytheon.com>
2004-09-01 17:09 ` Ingo Molnar
-- strict thread matches above, loose matches on Subject: below --
2004-09-01 15:21 Mark_H_Johnson
2004-09-02 22:24 ` Ingo Molnar
2004-09-01 14:37 Mark_H_Johnson
2004-09-01 19:31 ` Takashi Iwai
[not found] <2yiVZ-IZ-15@gated-at.bofh.it>
[not found] ` <2ylhi-2hg-3@gated-at.bofh.it>
[not found] ` <2ynLU-42D-7@gated-at.bofh.it>
[not found] ` <2yqJJ-5ZL-1@gated-at.bofh.it>
[not found] ` <2yQkS-6Zh-13@gated-at.bofh.it>
[not found] ` <2zaCV-4FE-3@gated-at.bofh.it>
[not found] ` <2zaWk-4Yj-9@gated-at.bofh.it>
[not found] ` <2zmE8-4Zz-11@gated-at.bofh.it>
[not found] ` <2zngP-5wD-9@gated-at.bofh.it>
[not found] ` <2zngP-5wD-7@gated-at.bofh.it>
[not found] ` <2znJS-5Pm-25@gated-at.bofh.it>
2004-08-31 23:06 ` Andi Kleen
[not found] ` <2znJS-5Pm-27@gated-at.bofh.it>
[not found] ` <2znJS-5Pm-29@gated-at.bofh.it>
[not found] ` <2znJS-5Pm-31@gated-at.bofh.it>
[not found] ` <2znJS-5Pm-33@gated-at.bofh.it>
2004-08-31 23:10 ` Andi Kleen
2004-09-01 7:05 ` Ingo Molnar
2004-08-31 20:10 Mark_H_Johnson
2004-08-31 20:37 ` Ingo Molnar
2004-08-31 15:17 Mark_H_Johnson
2004-08-31 17:20 ` Lee Revell
2004-08-31 18:09 ` Lee Revell
2004-08-31 18:53 ` Takashi Iwai
2004-08-31 18:56 ` Ingo Molnar
2004-09-02 16:59 ` Jaroslav Kysela
2004-09-02 17:50 ` Lee Revell
2004-08-31 18:19 ` Takashi Iwai
2004-08-31 18:48 ` Ingo Molnar
2004-08-31 19:02 ` Takashi Iwai
2004-08-31 18:50 ` Ingo Molnar
2004-08-30 22:04 Mark_H_Johnson
2004-08-31 6:31 ` Ingo Molnar
2004-09-01 7:30 ` Ingo Molnar
2004-08-30 19:13 Mark_H_Johnson
2004-08-30 19:21 ` Ingo Molnar
2004-08-31 8:49 ` Ingo Molnar
2004-09-02 6:33 ` Ingo Molnar
2004-08-28 17:52 [patch] voluntary-preempt-2.6.9-rc1-bk4-Q0 Lee Revell
2004-08-28 19:44 ` [patch] voluntary-preempt-2.6.9-rc1-bk4-Q2 Ingo Molnar
2004-08-28 20:10 ` Daniel Schmitt
2004-08-28 20:31 ` [patch] voluntary-preempt-2.6.9-rc1-bk4-Q3 Ingo Molnar
2004-08-28 21:10 ` Lee Revell
2004-08-28 21:13 ` Ingo Molnar
2004-08-28 21:16 ` Lee Revell
2004-08-28 23:51 ` Lee Revell
2004-08-29 2:35 ` Lee Revell
2004-08-29 5:43 ` [patch] voluntary-preempt-2.6.9-rc1-bk4-Q4 Ingo Molnar
2004-08-30 9:06 ` [patch] voluntary-preempt-2.6.9-rc1-bk4-Q5 Ingo Molnar
2004-08-30 14:25 ` Thomas Charbonnel
2004-08-30 18:00 ` Ingo Molnar
2004-08-31 19:23 ` Thomas Charbonnel
2004-08-31 19:30 ` Ingo Molnar
2004-08-31 19:45 ` Thomas Charbonnel
2004-08-31 6:40 ` Lee Revell
2004-08-31 6:53 ` Ingo Molnar
2004-08-31 23:03 ` Lee Revell
2004-09-01 15:52 ` Martin Josefsson
2004-09-01 21:15 ` Lee Revell
2004-09-01 21:30 ` Lee Revell
2004-08-31 7:06 ` Ingo Molnar
2004-08-31 19:21 ` Lee Revell
2004-08-31 19:37 ` Ingo Molnar
2004-08-31 19:47 ` Lee Revell
2004-08-31 19:51 ` Ingo Molnar
2004-08-31 20:09 ` Ingo Molnar
2004-08-31 20:10 ` Lee Revell
2004-08-31 20:14 ` Ingo Molnar
2004-08-31 20:20 ` Ingo Molnar
2004-08-31 20:34 ` Lee Revell
2004-08-31 20:39 ` Ingo Molnar
2004-08-31 20:41 ` Lee Revell
2004-08-31 17:40 ` Peter Zijlstra
2004-09-01 1:43 ` Lee Revell
2004-09-01 2:30 ` Lee Revell
2004-09-01 7:27 ` Lee Revell
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