Re: ULE/SCHED_SMP diff for 7.0

Claus Guttesen wrote:
>> http://people.freebsd.org/~jeff/ule.diff
>>
>> This patch is scheduled for inclusion in 7.0.  I would like anyone who
>> cares to run it to validate that it does not create any stability or
>> performance regression over the existing ULE.  This patch replaces ULE
>> with SCHED_SMP, which will now no longer exist as a seperate fork of 
>> ULE.
>
> Applied the patch and tried to compile new kernel. However I get:
>
> julie/usr/src#>time make -j 3 buildkernel
> --------------------------------------------------------------
>>>> Kernel build for WEBSRV started on Tue Jul 17 10:56:34 CEST 2007
> --------------------------------------------------------------
> ===> WEBSRV
> mkdir -p /usr/obj/usr/src/sys
> --------------------------------------------------------------
>>>> stage 1: configuring the kernel
> --------------------------------------------------------------
> cd /usr/src/sys/amd64/conf;
> PATH=/usr/obj/usr/src/tmp/legacy/usr/sbin:/usr/obj/usr/src/tmp/legacy/usr/bin:/usr/obj/usr/src/tmp/legacy/usr/games:/usr/obj/usr/src/tmp/usr/sbin:/usr/obj/usr/src/tmp/usr/bin:/usr/obj/usr/src/tmp/usr/games:/sbin:/bin:/usr/sbin:/usr/bin 
>
> config  -d /usr/obj/usr/src/sys/WEBSRV
> /usr/src/sys/amd64/conf/WEBSRV
> /usr/src/sys/amd64/conf/WEBSRV: unknown option "SCHED_SMP"
> *** Error code 1
> 1 error
> *** Error code 2
> 1 error
> make -j 3 buildkernel  0.06s user 0.04s system 101% cpu 0.101 total
>
> I have
>
> options         SCHED_SMP               # Newer SMP scheduler
>
> in my kernel.
>
> Hunk succeeded everytime, src is from last week.
>

    Excellent work Jeff (with note to whoever modified the fs code as 
well)! My fat program seems to have survived 4 complete iterations of 1 
million reads and writes, all without issue, with my printf statements 
that appeared to have stimulated a race condition at ~90k reads and 
writes before.

    I'll let it run overnight to completion (another 46 tries), and let 
you know how it goes :)..

    System is a UP amd64 capable VMware host.

Thanks,
-Garrett