Messages in this thread | | | Date | Wed, 24 May 2006 10:55:48 -0700 | From | Hans Reiser <> | Subject | Re: [PATCH] updated reiser4 - reduced cpu usage for writes by writing more than 4k at a time (has implications for generic write code and eventually for the IO layer) |
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Tom Vier wrote:
>On Tue, May 23, 2006 at 01:14:54PM -0700, Hans Reiser wrote: > > >>underlying FS can be improved. Performance results show that the new >>code consumes 40% less CPU when doing "dd bs=1MB ....." (your hardware, >>and whether the data is in cache, may vary this result). Note that this >>has only a small effect on elapsed time for most hardware. >> >> > >Write requests in linux are restricted to one page? > > > It may go to the kernel as a 64MB write, but VFS sends it to the FS as 64MB/4k separate 4k writes. - 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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