Messages in this thread | | | Date | Thu, 14 Oct 2004 17:31:59 +1000 | From | Nick Piggin <> | Subject | Re: Page cache write performance issue |
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Nathan Scott wrote: > On Wed, Oct 13, 2004 at 08:20:41PM -0700, Andrew Morton wrote: > >>Nathan Scott <nathans@sgi.com> wrote: >> >>> I just tried switching CONFIG_HIGHMEM off, and so running the >>> machine with 512MB; then adjusted the test to write 256M into >>> the page cache, again in 1K sequential chunks. A similar mis- >>> behaviour happens, though the numbers are slightly better (up >>> from ~4 to ~6.5MB/sec). Both ext2 and xfs see this. When I >>> drop the file size down to 128M with this kernel, I see good >>> results again (as we'd expect). >> >>No such problem here, with >> >> dd if=/dev/zero of=x bs=1k count=128k >> >>on a 256MB machine. xfs and ext2. > > > Yup, rebooted with mem=128M and on my box, & that crawls. > Maybe its just this old hunk 'o junk, I suppose; odd that > 2.6.8 was OK with this though. >
Just out of interest, can you get profiles and a few lines of vmstat 1 from 2.6.8 and 2.6.9-rc, 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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