Re: [PATCH] sched: high-res preemption tick

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To: Peter Zijlstra <a.p.zijlstra@...>

Cc: linux-kernel <linux-kernel@...>, Ingo Molnar <mingo@...>, Thomas Gleixner <tglx@...>

Subject: Re: [PATCH] sched: high-res preemption tick

Date: Saturday, October 13, 2007 - 3:18 am

On Fri, 2007-10-12 at 22:51 +0200, Peter Zijlstra wrote:
quoted text> Subject: sched: high-res preemption tick
> 
> Use HR-timers (when available) to deliver an accurate preemption tick.

This patch further reduced iperf context switching, and boosted
throughput.

iperf -c localhost -P 10 -t 300

Previously reported numbers

2.6.23-smp
[SUM]  0.0-300.0 sec    153 GBytes  4.39 Gbits/sec
[SUM]  0.0-300.1 sec    148 GBytes  4.23 Gbits/sec
[SUM]  0.0-300.0 sec    152 GBytes  4.36 Gbits/sec

2.6.23-smp-d (sched-devel)
[SUM]  0.0-300.0 sec    173 GBytes  4.96 Gbits/sec
[SUM]  0.0-300.1 sec    173 GBytes  4.96 Gbits/sec
[SUM]  0.0-300.0 sec    172 GBytes  4.93 Gbits/sec

Numbers from fresh pull today

2.6.23-smp-d-hrt
(re-enable PREEMPT_RESTRICT)
[SUM]  0.0-300.1 sec    181 GBytes  5.19 Gbits/sec
[SUM]  0.0-300.0 sec    182 GBytes  5.22 Gbits/sec
[SUM]  0.0-300.1 sec    182 GBytes  5.22 Gbits/sec

2.6.23-smp-d
[SUM]  0.0-300.1 sec    174 GBytes  4.97 Gbits/sec
[SUM]  0.0-300.1 sec    173 GBytes  4.95 Gbits/sec
[SUM]  0.0-300.1 sec    173 GBytes  4.96 Gbits/sec


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Messages in current thread:

[PATCH] sched: high-res preemption tick, Peter Zijlstra, (Fri Oct 12, 4:51 pm)

[RFC][PATCH] sched: SCHED_FIFO watchdog timer, Peter Zijlstra, (Sat Oct 13, 6:51 pm)

Re: [RFC][PATCH] sched: SCHED_FIFO watchdog timer, Kay Sievers, (Mon Oct 15, 5:32 pm)

Re: [RFC][PATCH] sched: SCHED_FIFO watchdog timer, Lennart Poettering, (Mon Oct 15, 10:25 am)

Re: [RFC][PATCH] sched: SCHED_FIFO watchdog timer, Dmitry Adamushko, (Mon Oct 15, 9:26 am)

Re: [RFC][PATCH] sched: SCHED_FIFO watchdog timer, Peter Zijlstra, (Mon Oct 15, 9:57 am)

Re: [PATCH] sched: high-res preemption tick, Mike Galbraith, (Sat Oct 13, 3:18 am)

Re: [PATCH] sched: high-res preemption tick, Peter Zijlstra, (Sat Oct 13, 4:55 am)

Re: [PATCH] sched: high-res preemption tick, Peter Zijlstra, (Sat Oct 13, 5:17 am)

Re: [PATCH] sched: high-res preemption tick, Peter Zijlstra, (Sat Oct 13, 7:13 pm)

Re: [PATCH] sched: high-res preemption tick, Mike Galbraith, (Sun Oct 14, 2:34 am)

Re: [PATCH] sched: high-res preemption tick, Peter Zijlstra, (Sat Oct 13, 7:16 pm)

Re: [PATCH] sched: high-res preemption tick, Mike Galbraith, (Sat Oct 13, 6:11 am)


linux-kernel:
Jeff Garzik	Re: Dual-Licensing Linux Kernel with GPL V2 and GPL V3
Christoph Hellwig	Re: [malware-list] [RFC 0/5] [TALPA] Intro to a linux interface for on access scan...
Heiko Carstens	Re: -mm merge plans for 2.6.23 -- sys_fallocate
Greg KH	[GIT PATCH] driver core patches against 2.6.24
git:

linux-netdev:
Jarek Poplawski	[PATCH] pkt_sched: Destroy gen estimators under rtnl_lock().
Arjan van de Ven	Re: [GIT]: Networking
Jens Axboe	Re: [BUG] New Kernel Bugs
Gerrit Renker	[PATCH 27/37] dccp: Integration of dynamic feature activation - part 2 (server side)
netbsd-tech-kern:
Emmanuel Dreyfus	fixing send(2) semantics (kern/29750)
Christos Zoulas	Re: Melting down your network [Subject changed]
Juan RP	Changing the I/O scheduler on-the-fly
Emmanuel Dreyfus	Re: fixing send(2) semantics (kern/29750)

Re: [PATCH] sched: high-res preemption tick

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