Impressive to say the least :) Something tells me I'm going to love the upcoming kernel releases (and certainly 2.6 when it is there).
Lowlatency + native alsa support. Yummy :) best regards vincent On Fri, Jan 11, 2002 at 10:10:37PM +0100, Roger Larsson wrote: >Hi low latency lovers, > >With the improved throughput in dbench I think this got a better >chance to be included ... :-) > >/RogerL > >---------- Forwarded Message ---------- > >Subject: [PATCH] Preemptive Kernel for Ingo's O(1) scheduler >Date: 11 Jan 2002 16:04:54 -0500 >From: Robert Love <[EMAIL PROTECTED]> >To: [EMAIL PROTECTED] >Cc: [EMAIL PROTECTED], [EMAIL PROTECTED], [EMAIL PROTECTED], >[EMAIL PROTECTED] > >A version of preempt-kernel is now available for Ingo's O(1) scheduler. > >For 2.5.2-pre11: > ftp://ftp.kernel.org/pub/linux/kernel/people/rml/preempt-kernel/v2.5/preempt- >kernel-rml-2.5.2-pre11-1.patch For 2.4.18-pre3 + sched-O1-H6: > ftp://ftp.kernel.org/pub/linux/kernel/people/rml/preempt-kernel/v2.4/ingo-O1- >sched/preempt-kernel-rml-2.4.18-pre3-ingo-1.patch > >Because of changes in load_balance, I suggest not using preempt-kernel >and an additional sched update on 2.5. I'll update as the patches are >merged into 2.5. > >Making the kernel fully preemptible should be synergistic with Ingo's >scheduler with its faster task dispatch time and better RT support. > >Getting the two to play together was not hard, albeit a bit of a pain. >The actually scheduling support is less, due to the simplified schedule >and schedule_tail, although there is added code for making the per-CPU >runqueues preempt-safe. > >Benchmarks: > >2.5.2-pre11 dbench 16: 24.5364 MB/s >2.5.2-pre11-preempt dbench 16: 27.5192 MB/s > >2.5.2-pre11 latencytest: >worst-case latency is 18.7ms with 96% scheduling latency on-time >2.5.2-pre11-preempt latencytest: >6ms (<1.5ms in all but disk write) with 99.9% scheduling latency on-time > >2.5.2-pre11-preempt avg latency is 1.1ms (for an arbitray work-load I >tested with). The obstacle for sub-ms average latency is still the >long-held spinlocks that can be 100ms+. > >Full ChangeLog: > >- make preempt-kernel and Ingo's O(1) scheduler play nicely > >- (2.5 only) more include additions > >- various cleanups and such > >Comments, patches, etc. are appreciated. While it is running stable >here in both SMP and UP on both 2.4 and 2.5, more testing could reveal >problems. Also, some optimization could be done at this point to >hopefully reduce overhead. Enjoy, > > Robert Love > >- >To unsubscribe from this list: send the line "unsubscribe linux-kernel" in >the body of a message to [EMAIL PROTECTED] >More majordomo info at http://vger.kernel.org/majordomo-info.html >Please read the FAQ at http://www.tux.org/lkml/ > >------------------------------------------------------- > >-- >Roger Larsson >Skellefte� >Sweden
