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SATA Harddisk speed drop of 100 MB/s

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From: Carlo Wood
Subject: SATA Harddisk speed drop of 100 MB/s
Date: Wednesday, June 20, 2007 - 3:48 pm

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.

-- 
Carlo Wood <carlo@alinoe.com>
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Messages in current thread:
SATA Harddisk speed drop of 100 MB/s, Carlo Wood, (Wed Jun 20, 3:48 pm)
Re: SATA Harddisk speed drop of 100 MB/s, Jeff Garzik, (Wed Jun 20, 4:06 pm)
Re: SATA Harddisk speed drop of 100 MB/s, Arjan van de Ven, (Wed Jun 20, 8:36 pm)
Re: SATA Harddisk speed drop of 100 MB/s, Carlo Wood, (Fri Jun 22, 9:21 am)
Re: SATA Harddisk speed drop of 100 MB/s, Henrique de Moraes H ..., (Fri Jun 22, 2:17 pm)
Re: SATA Harddisk speed drop of 100 MB/s, Carlo Wood, (Fri Jun 22, 2:27 pm)
Re: SATA RAID5 speed drop of 100 MB/s, Carlo Wood, (Fri Jun 22, 2:44 pm)
Re: SATA RAID5 speed drop of 100 MB/s, Carlo Wood, (Fri Jun 22, 2:48 pm)
Re: SATA Harddisk speed drop of 100 MB/s, Henrique de Moraes H ..., (Fri Jun 22, 6:31 pm)
Re: SATA Harddisk speed drop of 100 MB/s, Carlo Wood, (Fri Jun 22, 7:59 pm)
Re: SATA RAID5 speed drop of 100 MB/s, Carlo Wood, (Fri Jun 22, 8:54 pm)
Re: SATA RAID5 speed drop of 100 MB/s, Tejun Heo, (Fri Jun 22, 11:22 pm)
Re: SATA RAID5 speed drop of 100 MB/s, Jeff Garzik, (Sat Jun 23, 12:03 am)
Re: SATA RAID5 speed drop of 100 MB/s, Tejun Heo, (Sat Jun 23, 12:54 am)
Re: SATA RAID5 speed drop of 100 MB/s, Carlo Wood, (Sat Jun 23, 5:53 am)
Re: SATA Harddisk speed drop of 100 MB/s, Andrew Morton, (Sat Jun 23, 10:29 am)
Re: SATA RAID5 speed drop of 100 MB/s, Bartlomiej Zolnierki ..., (Sat Jun 23, 10:30 am)
Re: SATA Harddisk speed drop of 100 MB/s, Jeff Garzik, (Sat Jun 23, 3:21 pm)
Re: SATA RAID5 speed drop of 100 MB/s, Jeff Garzik, (Sat Jun 23, 3:43 pm)
Re: SATA RAID5 speed drop of 100 MB/s, Michael Tokarev, (Sun Jun 24, 4:58 am)
Re: SATA RAID5 speed drop of 100 MB/s, Dr. David Alan Gilbert, (Sun Jun 24, 5:59 am)
Re: SATA RAID5 speed drop of 100 MB/s, Justin Piszcz, (Sun Jun 24, 7:21 am)
Re: SATA RAID5 speed drop of 100 MB/s, Michael Tokarev, (Sun Jun 24, 8:48 am)
Re: SATA RAID5 speed drop of 100 MB/s, Michael Tokarev, (Sun Jun 24, 8:52 am)
Re: SATA RAID5 speed drop of 100 MB/s, Justin Piszcz, (Sun Jun 24, 9:59 am)
Re: SATA RAID5 speed drop of 100 MB/s, Carlo Wood, (Sun Jun 24, 3:07 pm)
Re: SATA RAID5 speed drop of 100 MB/s, Mark Lord, (Sun Jun 24, 4:46 pm)
Re: SATA RAID5 speed drop of 100 MB/s, Patrick Mau, (Sun Jun 24, 5:23 pm)
Re: SATA Harddisk speed drop of 100 MB/s, Lennart Sorensen, (Mon Jun 25, 8:18 am)
Re: SATA Harddisk speed drop of 100 MB/s, Carlo Wood, (Mon Jun 25, 9:04 am)
Re: SATA RAID5 speed drop of 100 MB/s, Phillip Susi, (Thu Jul 5, 3:12 pm)