On 13.8.2010 18:01, Kevin Oberman wrote:
For some time I have seen very odd issues with IO performance on
8-Stable. Going back to November of last year when 8.0 was released, I
see variations of up to 22% in identical operations. This is not a
degradation as the performance moves up and down.
From: Ivan Voras ivo...@freebsd.org
Date: Mon, 16 Aug 2010 15:03:23 +0200
Sender: owner-freebsd-sta...@freebsd.org
On 13.8.2010 18:01, Kevin Oberman wrote:
For some time I have seen very odd issues with IO performance on
8-Stable. Going back to November of last year when 8.0 was
On Mon, Aug 16, 2010 at 07:46:38AM -0700, Kevin Oberman wrote:
From: Ivan Voras ivo...@freebsd.org
Date: Mon, 16 Aug 2010 15:03:23 +0200
Sender: owner-freebsd-sta...@freebsd.org
On 13.8.2010 18:01, Kevin Oberman wrote:
For some time I have seen very odd issues with IO performance on
On Mon, Aug 16, 2010 at 08:33:16AM -0700, Jeremy Chadwick wrote:
On Mon, Aug 16, 2010 at 07:46:38AM -0700, Kevin Oberman wrote:
From: Ivan Voras ivo...@freebsd.org
Date: Mon, 16 Aug 2010 15:03:23 +0200
Sender: owner-freebsd-sta...@freebsd.org
On 13.8.2010 18:01, Kevin Oberman
Date: Sun, 15 Aug 2010 00:07:40 +0200
From: Roland Smith rsm...@xs4all.nl
Sender: owner-freebsd-sta...@freebsd.org
On Sat, Aug 14, 2010 at 02:36:31AM +0200, Roland Smith wrote:
On Fri, Aug 13, 2010 at 01:36:12PM -1000, Clifton Royston wrote:
Both figures seem quite low to me? I cannot
On Sun, Aug 15, 2010 at 12:37:03PM -0700, Kevin Oberman wrote:
OK. It's pretty clear that disk IO is terrible on this system. I suspect
it's the SATA/PATA converter that is the throttle. In any case,
snip
I still have no explanation for the variation. It's not vibration. Some
of my best times
On Fri, 13 Aug 2010, Kevin Oberman wrote:
Date: Sat, 14 Aug 2010 11:06:58 +0800
From: TJ Varghese t...@tjvarghese.com
[..]
You're using a laptop with 2 HDDs, so does that mean you're using the
Ultrabay for the 2nd HDD?
Perhaps anything connected to that drops down to ATA33 (pure
On Saturday 14 August 2010 05:57:51 Kevin Oberman wrote:
Date: Sat, 14 Aug 2010 11:33:57 +0800
From: TJ Varghese t...@tjvarghese.com
The deviation in your disk I/O isn't a major surprise (to me anyway),
given the system specs. What *does* surprise me is your abysmal I/O
speeds in
On Sat, Aug 14, 2010 at 02:36:31AM +0200, Roland Smith wrote:
On Fri, Aug 13, 2010 at 01:36:12PM -1000, Clifton Royston wrote:
Both figures seem quite low to me? I cannot exactly reproduce your test,
because I don't have an empty second disk handy, but doing
dd if=/dev/zero bs=1m
For some time I have seen very odd issues with IO performance on
8-Stable. Going back to November of last year when 8.0 was released, I
see variations of up to 22% in identical operations. This is not a
degradation as the performance moves up and down.
This is a very simplistic case. I have two
Am 13.08.2010 um 18:01 schrieb Kevin Oberman:
Note the dramatic differences even on the same kernel. For the December
6 kernel, for example, I see a maximum of 23,676,086 and a minimum of
just 18,304,565.
Are the disks still OK? If any sectors have been remapped between runs,
From: Stefan Bethke s...@lassitu.de
Date: Fri, 13 Aug 2010 22:23:08 +0200
Am 13.08.2010 um 18:01 schrieb Kevin Oberman:
Note the dramatic differences even on the same kernel. For the December
6 kernel, for example, I see a maximum of 23,676,086 and a minimum of
just 18,304,565.
On Fri, Aug 13, 2010 at 09:01:09AM -0700, Kevin Oberman wrote:
For some time I have seen very odd issues with IO performance on
8-Stable. Going back to November of last year when 8.0 was released, I
see variations of up to 22% in identical operations. This is not a
degradation as the
On Fri, Aug 13, 2010 at 09:01:09AM -0700, Kevin Oberman wrote:
For some time I have seen very odd issues with IO performance on
8-Stable. Going back to November of last year when 8.0 was released, I
see variations of up to 22% in identical operations. This is not a
degradation as the
On Fri, Aug 13, 2010 at 11:32:05PM +0200, Roland Smith wrote:
On Fri, Aug 13, 2010 at 09:01:09AM -0700, Kevin Oberman wrote:
For some time I have seen very odd issues with IO performance on
8-Stable. Going back to November of last year when 8.0 was released, I
see variations of up to 22% in
On Fri, Aug 13, 2010 at 01:36:12PM -1000, Clifton Royston wrote:
Both figures seem quite low to me? I cannot exactly reproduce your test,
because I don't have an empty second disk handy, but doing
dd if=/dev/zero bs=1m count=100 of=/tmp/foo
With a total write size of 100MB,
Date: Fri, 13 Aug 2010 23:32:05 +0200
From: Roland Smith rsm...@xs4all.nl
On Fri, Aug 13, 2010 at 09:01:09AM -0700, Kevin Oberman wrote:
For some time I have seen very odd issues with IO performance on
8-Stable. Going back to November of last year when 8.0 was released, I
see variations
Date: Fri, 13 Aug 2010 16:29:54 -0700
From: Jeremy Chadwick free...@jdc.parodius.com
On Fri, Aug 13, 2010 at 09:01:09AM -0700, Kevin Oberman wrote:
For some time I have seen very odd issues with IO performance on
8-Stable. Going back to November of last year when 8.0 was released, I
see
Maybe there is a hardware component here? Are both disks on the same
controller? Or if not are both controllers using the same interrupt line?
No. Each is on its one controller and is the only disk on that
controller.
You should have a look at 'systat -vmstat' with dd running in the
The deviation in your disk I/O isn't a major surprise (to me anyway),
given the system specs. What *does* surprise me is your abysmal I/O
speeds in general. 18MB/sec min, 24MB/sec max?! ICH6-M can do a lot
more than that. Something isn't right.
it's possible that the hw is...suboptimal.
Date: Sat, 14 Aug 2010 11:06:58 +0800
From: TJ Varghese t...@tjvarghese.com
Maybe there is a hardware component here? Are both disks on the same
controller? Or if not are both controllers using the same interrupt line?
No. Each is on its one controller and is the only disk on
On Fri, Aug 13, 2010 at 01:36:12PM -1000, Clifton Royston wrote:
On Fri, Aug 13, 2010 at 11:32:05PM +0200, Roland Smith wrote:
On Fri, Aug 13, 2010 at 09:01:09AM -0700, Kevin Oberman wrote:
For some time I have seen very odd issues with IO performance on
8-Stable. Going back to November
Date: Sat, 14 Aug 2010 11:33:57 +0800
From: TJ Varghese t...@tjvarghese.com
The deviation in your disk I/O isn't a major surprise (to me anyway),
given the system specs. What *does* surprise me is your abysmal I/O
speeds in general. 18MB/sec min, 24MB/sec max?! ICH6-M can do a lot
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