Date: Mon, 2 Jul 2007 19:56:00 +0100 From: Thomas Sparrevohn <Thomas.Sparrevohn@btinternet.com> To: freebsd-current@freebsd.org Subject: Re: New SCHED_SMP diff. Message-ID: <200707021956.01128.Thomas.Sparrevohn@btinternet.com> In-Reply-To: <499c70c0707020950p180d88e1q109b1a1c820d8283@mail.gmail.com> References: <20070701224452.I552@10.0.0.1> <499c70c0707020950p180d88e1q109b1a1c820d8283@mail.gmail.com>
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On Monday 02 July 2007 17:50:44 Abdullah Ibn Hamad Al-Marri wrote:
> On 7/2/07, Jeff Roberson <jroberson@chesapeake.net> wrote:
> > I fixed a major bug in SCHED_SMP that impacted some users causing bad
> > performance and invalid load counts. Attilio also added support for i386
> > based machines. I have tested on UP which works although INVARIANTS and
> > WITNESS don't work properly on UP kernels. Single processor SMP kernels
> > work fine.
> >
> > This diff also includes another patch that I intend to commit to current
> > which significantly improved write performance for mysql by removing
> > all use of Giant in fcntl().
> >
> > Please report any stability or performance problems with this patch. The
> > more positive reports I get the more likely it will go into 7.0.
> >
> > Thanks,
> > Jeff
>
> Jeff,
>
> This makes my Intel C2D E6660 get really busy, and MySQL 5.0.41 from
> ports run faster :)
>
> Thanks for making such great SCHED, when will you make it in the tree? :)
>
Hmm - Weird it gives negative results on my C2D XQ6700 - I ran four
tests using "make world" benchmark - I am using ZFS for all filesystems
except root - however I would not think that matters - I tested with "-j 8"
and "-j 4" but it did not change the overall result
SCHED_SMP - rm -rf /usr/obj/* && /usr/bin/time -l make -j 4 buildworld
1272.53 real 2482.83 user 945.08 sys
1268.45 real 2483.46 user 950.95 sys
1274.19 real 2481.91 user 953.19 sys
1292.27 real 2482.59 user 957.37 sys
2423814 voluntary context switches
885934 involuntary context switches
SCHED_4BSD - rm -rf /usr/obj/* && /usr/bin/time -l make -j 4 buildworld
1125.28 real 2675.17 user 1055.18 sys
1124.74 real 2684.95 user 1057.64 sys
1123.76 real 2678.64 user 1061.89 sys
1120.68 real 2676.78 user 1061.03 sys
2587885 voluntary context switches
708274 involuntary context switches
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