Re: New SCHED_SMP diff.

On Monday 02 July 2007 20:02:41 Jeff Roberson wrote:
> On Mon, 2 Jul 2007, Thomas Sparrevohn wrote:
> 
> > On Monday 02 July 2007 17:50:44 Abdullah Ibn Hamad Al-Marri wrote:
> >> On 7/2/07, Jeff Roberson <jroberson_at_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
> >
> 
> Hi, can you try sysctl kern.sched.steal_busy=1?  Please tell me if that 
> improves things.  This will resolve short-term load imbalances by stealing 
> threads from other processors.
> 
> Thanks,
> Jeff
> 

Naturally - It did seem to go idle a lot - I be back in an hour 
> >
> > 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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