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
> > > Date: Mon, 16 Aug 2010 15:03:23 +0200
> > > Sender: owner-freebsd-sta...@freebsd.org
> > >
> > > On 13.8.2010 18:01, Kevin Oberman wrote
On Mon, Aug 16, 2010 at 07:46:38AM -0700, Kevin Oberman wrote:
> > From: Ivan Voras
> > 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
> > >
> From: Ivan Voras
> 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 released, I
> > se
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 dow
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,
> I still have no explanation for the variation. It's not vibration. Some
> of my best times w
> Date: Sun, 15 Aug 2010 00:07:40 +0200
> From: Roland Smith
> 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 exactl
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=/de
On Saturday 14 August 2010 05:57:51 Kevin Oberman wrote:
> > Date: Sat, 14 Aug 2010 11:33:57 +0800
> > From: TJ Varghese
> >
> > > 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 genera
On Fri, 13 Aug 2010, Kevin Oberman wrote:
> > Date: Sat, 14 Aug 2010 11:06:58 +0800
> > From: TJ Varghese
[..]
> > 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 speculation o
> Date: Sat, 14 Aug 2010 11:33:57 +0800
> From: TJ Varghese
>
> > 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
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 No
> Date: Sat, 14 Aug 2010 11:06:58 +0800
> From: TJ Varghese
>
> >
>
> > > 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
>
> 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...subopti
>
> > 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
> Date: Fri, 13 Aug 2010 16:29:54 -0700
> From: Jeremy Chadwick
>
> 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
> Date: Fri, 13 Aug 2010 23:32:05 +0200
> From: Roland Smith
>
> 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
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 10
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
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 perfor
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 perfor
> From: Stefan Bethke
> 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.
>
> A
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,
additio
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 id
23 matches
Mail list logo
