Re: [Linux-cluster] 2.6.11-based GFS's concurrent-read performance declined badly

[Ken Preslan <kpreslan redhat com>]

On Sat, Mar 19, 2005 at 12:39:32AM +0800, ?????? wrote:
> 	After I updated GFS code from CVS on 2005/03/15 and 
> updated the kernel from kernel.org to version 2.6.11.3
> The GFS's concurrent-read performance declined badly, from 150MB/s to 50MB/s. 
> When I used the kernel 2.6.9-1.667, the read rate was about 150MB/s,
> but now I only have 50MB/s with the same test. My test is to concurrently read
> (with pthread) 200 files on the same GFS directory. 
> The single read/write performance was the same as the 2.6.9-based GFS, as my test.
> 
> So what's the matter? I'm amazed badly...
> 
> Thanks for any help.

Do you see a similar drop in performance when you run your test on
ext3 on the two kernels?

-- 
Ken Preslan <kpreslan redhat com>