Messages in this thread |  | | Date | Thu, 4 Jan 2001 00:38:53 -0200 (BRST) | From | Marcelo Tosatti <> | Subject | Re: bdflush synchronous IO on prerelease-diff |
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On Wed, 3 Jan 2001, Marcelo Tosatti wrote:
> > Hi Linus, > > I've noticed you changed bdflush to do synchronous IO on page_launder(). > > That seems to be a performance problem, since kflushd will have to wait > for dirty buffers to get synced instead looping on the inactive dirty > list more often. > > Here is a patch to change this. > > --- linux.orig/fs/buffer.c Wed Jan 3 22:43:24 2001 > +++ linux/fs/buffer.c Thu Jan 4 00:28:50 2001 > @@ -2710,7 +2710,7 @@ > > flushed = flush_dirty_buffers(0); > if (free_shortage()) > - flushed += page_launder(GFP_KERNEL, 1); > + flushed += page_launder(GFP_KERNEL, 0); > > /* > * If there are still a lot of dirty buffers around,
And here are some dbench numbers:
12 clients / 64M ram without the patch: 10.04 Mb/s with the patch: 14.47 Mb/s
48 clients / 256M ram without the patch: 14.40 Mb/s with the patch: 15.69 Mb/s
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