From: Mike Galbraith <efault@gmx.de>
To: Ingo Molnar <mingo@elte.hu>, Andrew Morton <akpm@osdl.org>
Cc: lkml <linux-kernel@vger.kernel.org>,
Peter Williams <pwil3058@bigpond.net.au>,
Nick Piggin <nickpiggin@yahoo.com.au>,
Con Kolivas <kernel@kolivas.org>
Subject: Re: [patch 2.6.16-mm2 10/9] sched throttle tree extract - kill interactive task feedback loop
Date: Wed, 05 Apr 2006 19:38:51 +0200 [thread overview]
Message-ID: <1144258731.7894.12.camel@homer> (raw)
In-Reply-To: <1143883915.7617.77.camel@homer>
Greetings,
The patch below stops interactive tasks from feeding off each other
during round-robin.
With this 10th patch in place, a busy server with _default_ throttle
settings (ie tunables may now be mostly unneeded) looks like this:
[root]:# w
18:38:00 up 23 min, 2 users, load average: 10.07, 9.94, 7.50
USER TTY LOGIN@ IDLE JCPU PCPU WHAT
root tty1 18:15 22:12 30.89s 30.84s top d1
root pts/0 18:20 0.00s 0.07s 0.00s w
[root]:# time netstat|grep :81|wc -l
1758
real 0m0.304s
user 0m0.144s
sys 0m0.135s
[root]:# time netstat|grep :81|wc -l
1776
real 0m0.306s
user 0m0.118s
sys 0m0.163s
[root]:# time netstat|grep :81|wc -l
1799
real 0m0.493s
user 0m0.146s
sys 0m0.141s
[root]:#
My desktop still feels just peachy.
Signed-off-by: Mike Galbraith <efault@gmx.de>
--- linux-2.6.16-mm2/kernel/sched.c-9.export_tunables 2006-03-31 13:37:09.000000000 +0200
+++ linux-2.6.16-mm2/kernel/sched.c 2006-04-05 19:22:01.000000000 +0200
@@ -3480,7 +3480,7 @@ go_idle:
queue = array->queue + idx;
next = list_entry(queue->next, task_t, run_list);
- if (!rt_task(next) && interactive_sleep(next->sleep_type)) {
+ if (!TASK_INTERACTIVE(next) && interactive_sleep(next->sleep_type)) {
unsigned long long delta = now - next->timestamp;
if (unlikely((long long)(now - next->timestamp) < 0))
delta = 0;
next prev parent reply other threads:[~2006-04-05 17:38 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-04-01 8:28 [patch 2.6.16-mm2 0/9] sched throttle tree extract Mike Galbraith
2006-04-01 8:33 ` [patch 2.6.16-mm2 1/9] sched throttle tree extract - ignore invalid timestamps Mike Galbraith
2006-04-01 8:38 ` [patch 2.6.16-mm2 2/9] sched throttle tree extract - fix potential task uninterruptible bug Mike Galbraith
2006-04-01 8:44 ` [patch 2.6.16-mm2 3/9] sched throttle tree extract - remove IO priority barrier Mike Galbraith
2006-04-01 8:51 ` [patch 2.6.16-mm2 4/9] sched throttle tree extract - remove kthread barrier Mike Galbraith
2006-04-01 8:59 ` [patch 2.6.16-mm2 5/9] sched throttle tree extract - correct idle sleep logic Mike Galbraith
2006-04-01 9:12 ` [patch 2.6.16-mm2 6/9] sched throttle tree extract - move division to slow path Mike Galbraith
2006-04-01 9:23 ` [patch 2.6.16-mm2 7/9] sched throttle tree extract - implement throttling Mike Galbraith
2006-04-01 9:26 ` [patch 2.6.16-mm2 8/9] sched throttle tree extract - maximize timeslice accounting Mike Galbraith
2006-04-01 9:31 ` [patch 2.6.16-mm2 9/9] sched throttle tree extract - export tunables Mike Galbraith
2006-04-05 17:38 ` Mike Galbraith [this message]
2006-04-05 23:15 ` [patch 2.6.16-mm2 10/9] sched throttle tree extract - kill interactive task feedback loop Con Kolivas
2006-04-06 4:10 ` Mike Galbraith
2006-04-06 4:29 ` Con Kolivas
2006-04-01 16:53 ` [patch 2.6.16-mm2 5/9] sched throttle tree extract - correct idle sleep logic Lee Revell
2006-04-01 18:00 ` Mike Galbraith
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