lkml.org 
[lkml]   [2007]   [Jun]   [20]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
SubjectRe: SATA Harddisk speed drop of 100 MB/s
From
Date
On Wed, 2007-06-20 at 19:06 -0400, Jeff Garzik wrote:
> Carlo Wood wrote:
> > hdparm -tT gives over 160 MB/s for my tripple 10k rpm Raptor RAID5
> > on 2.6.18, as expected.
> >
> > In 2.6.22-rc5 this dropped to only 60 MB/s !
> >
> > Is this a known issue?
> >
> > I also measured it with bonnie; I get 108 MB/s reading speed on
> > 2.6.18 and only 68 MB/s on 2.6.22-rc5.
>
> More info needed... kernel config, before-and-after dmesg output, lspci
> output.




also do a

echo 60 > /proc/sys/vm/dirty_ratio

first to see if that helps

-
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/

\
 
 \ /
  Last update: 2007-06-21 05:43    [W:0.097 / U:0.108 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site