Messages in this thread | | | Date | Thu, 9 Dec 2004 14:52:37 -0800 | From | Andrew Morton <> | Subject | Re: page fault scalability patch V12: rss tasklist vs sloppy rss |
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Christoph Lameter <clameter@sgi.com> wrote: > > On Thu, 9 Dec 2004, Hugh Dickins wrote: > > > How do the scalability figures compare if you omit patch 7/7 i.e. revert > > the per-task rss complications you added in for Linus? I remain a fan > > of sloppy rss, which you earlier showed to be accurate enough (I'd say), > > though I guess should be checked on other architectures than your ia64. > > I can't see the point of all that added ugliness for numbers which don't > > need to be precise - but perhaps there's no way of rearranging fields, > > and the point at which mm->(anon_)rss is updated (near up of mmap_sem?), > > to avoid destructive cacheline bounce. What I'm asking is, do you have > > numbers to support 7/7? Perhaps it's the fact you showed up to 512 cpus > > this time, but only up to 32 with sloppy rss? The ratios do look better > > with the latest, but the numbers are altogether lower so we don't know. > > Here is a full set of numbers for sloppy and tasklist.
Yes, but that only tests the thing-which-you're-trying-to-improve. We also need to work out the impact of that tasklist walk on other people's worst cases.
> sloppy (2.6.10-bk14-rss-sloppy-prefault):
It would be helpful if you could generate a breif summary of benchmarking results as well as dumping the raw numbers, please. - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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