bwlimit on rsync locally

Reeve Yang reeve.yang at
Mon Mar 31 17:52:27 GMT 2008

Thanks John. I looked into this patch but it doesn't resolve my
problem, and we have have posix FADV.

I found a simple solution. Just open the file on receiver to be write
direct to disk avoid file buffer/cache. Of course the performance
sucks but it's what I need. The output block rate cannot be reduced by
2/3 based on my besting on linux 2.6.22. I can post the diff if
anybody wants.

- Reeve

On Sun, Mar 30, 2008 at 10:23 PM, John Van Essen <vanes002 at> wrote:
> On Fri, 28 Mar 2008, Reeve Yang <reeve.yang at> wrote:
>  > Is there anyway to make rsync use direct I/O bypassing FS buffer?
>  I'm not an expert on that by any means, but AFAIK, rsync supports that
>  only via this patch:
>  (You'll have to compile your own version of rsync.)
>     John
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