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* SATA Harddisk speed drop of 100 MB/s
@ 2007-06-20 22:48 Carlo Wood
  2007-06-20 23:06 ` Jeff Garzik
  0 siblings, 1 reply; 33+ messages in thread
From: Carlo Wood @ 2007-06-20 22:48 UTC (permalink / raw)
  To: linux-kernel

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>

^ permalink raw reply	[flat|nested] 33+ messages in thread
* Re: SATA RAID5 speed drop of 100 MB/s
@ 2007-06-24  9:01 Mikael Pettersson
  0 siblings, 0 replies; 33+ messages in thread
From: Mikael Pettersson @ 2007-06-24  9:01 UTC (permalink / raw)
  To: eyal, jeff; +Cc: linux-ide

On Sun, 24 Jun 2007 10:54:56 +1000, Eyal Lebedinsky wrote:
> Jeff Garzik wrote:
> [trim]
> > Given that some drives might be better tuned for benchmarks in
> > non-queued mode, and that a major behavior difference is that your
> > drives are now NCQ-enabled, the first thing I would suggest you try is
> > disabling NCQ:
> >     http://linux-ata.org/faq.html#ncq
> 
> I see in my bootup messages:
> ata6: SATA link up 1.5 Gbps (SStatus 113 SControl 300)
> ata6.00: ATA-7: WDC WD3200YS-01PGB0, 21.00M21, max UDMA/133
> ata6.00: 625142448 sectors, multi 0: LBA48 NCQ (depth 0/1)
> ata6.00: configured for UDMA/133
> 
> and I wonder how to interpret "NCQ (depth 0/1)". Does this drive
> support NCQ or not?
> 
> Controller:	Promise SATA-II-150-TX4.
> Kernel:		2.6.21.5, x86

Your drive does, but the driver for your controller does not (yet).

/Mikael

^ permalink raw reply	[flat|nested] 33+ messages in thread

end of thread, other threads:[~2007-07-05 22:12 UTC | newest]

Thread overview: 33+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2007-06-20 22:48 SATA Harddisk speed drop of 100 MB/s Carlo Wood
2007-06-20 23:06 ` Jeff Garzik
2007-06-21  3:36   ` Arjan van de Ven
2007-06-22 16:21     ` Carlo Wood
2007-06-22 21:17       ` Henrique de Moraes Holschuh
2007-06-22 21:27         ` Carlo Wood
2007-06-23  1:31           ` Henrique de Moraes Holschuh
2007-06-23  2:59             ` Carlo Wood
2007-06-23 17:29               ` Andrew Morton
2007-06-23 22:21                 ` Jeff Garzik
2007-06-25 15:18               ` Lennart Sorensen
2007-06-25 16:04                 ` Carlo Wood
2007-06-22 21:44   ` SATA RAID5 " Carlo Wood
2007-06-23  3:54     ` Carlo Wood
2007-06-23  6:22       ` Tejun Heo
2007-06-22 21:48   ` Carlo Wood
2007-06-23  7:03     ` Jeff Garzik
2007-06-23  7:54       ` Tejun Heo
2007-06-23 12:53       ` Carlo Wood
2007-06-23 17:30         ` Bartlomiej Zolnierkiewicz
2007-06-23 22:43         ` Jeff Garzik
2007-06-24 11:58           ` Michael Tokarev
2007-06-24 12:59             ` Dr. David Alan Gilbert
2007-06-24 14:21               ` Justin Piszcz
2007-06-24 15:52                 ` Michael Tokarev
2007-06-24 16:59                   ` Justin Piszcz
2007-06-24 22:07                     ` Carlo Wood
2007-06-24 23:46                       ` Mark Lord
2007-06-25  0:23                       ` Patrick Mau
2007-06-24 15:48               ` Michael Tokarev
2007-07-05 22:12             ` Phillip Susi
2007-06-24  0:54       ` Eyal Lebedinsky
  -- strict thread matches above, loose matches on Subject: below --
2007-06-24  9:01 Mikael Pettersson

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