Messages in this thread | | | Date | Sat, 19 Mar 2005 08:08:10 +0100 | From | Ingo Molnar <> | Subject | Re: Latency tests with 2.6.12-rc1 |
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* Lee Revell <rlrevell@joe-job.com> wrote:
> I did the same quick latency tests with 2.6.12-rc1 that I posted about > for 2.6.11 a few weeks ago. > > 2.6.12-rc1 is significantly better than 2.6.11. Running JACK at 64 > frames (1.3 ms) works very well. I was not able to produce xruns even > with "dbench 64", which slows the system to a crawl. With 2.6.11, I > could easily produce xruns with much lighter loads. > > It would appear that the latency issues related to the 4 level page > tables merge have been resolved.
great! The change in question is most likely the copy_page_range() fix that Hugh resurrected:
ChangeSet 1.2037, 2005/03/08 09:26:46-08:00, hugh@veritas.com
[PATCH] copy_pte_range latency fix
Ingo's patch to reduce scheduling latencies, by checking for lockbreak in copy_page_range, was in the -VP and -mm patchsets some months ago; but got preempted by the 4level rework, and not reinstated since. Restore it now in copy_pte_range - which mercifully makes it easier.
are the ext3 related latencies are gone as well - or are you working it around by not using data=ordered?
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