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DateWed, 24 May 2006 10:55:48 -0700
FromHans Reiser <>
SubjectRe: [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)
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.
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