Larry McVoy wrote:
>
> As someone pointed out, the URLs I sent are wrong, they are
>
> http://www.bitmover.com/disks/bw.gif
> http://www.bitmover.com/disks/seek.gif
http://www.bitwizard.nl/maxtor_2.speeds.gif
(yes, vertical axis is MB per second)
is what my measurement tool makes
Larry McVoy wrote:
As someone pointed out, the URLs I sent are wrong, they are
http://www.bitmover.com/disks/bw.gif
http://www.bitmover.com/disks/seek.gif
http://www.bitwizard.nl/maxtor_2.speeds.gif
(yes, vertical axis is MB per second)
is what my measurement tool makes of
As someone pointed out, the URLs I sent are wrong, they are
http://www.bitmover.com/disks/bw.gif
http://www.bitmover.com/disks/seek.gif
I forgot the disks part.
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Larry McVoy lm at bitmover.com http://www.bitmover.com/lm
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On Tue, 17 Oct 2000, Larry McVoy wrote:
> Sure, I did it over the protests of other people and I learned something,
> you have every right to do the same thing. In fact, it's great that you
> are doing it. Just don't get all bent out of shape if you tweaking the
> elevator alg does nothing
On Tue, Oct 17, 2000 at 09:49:35AM -0700, Andre Hedrick wrote:
> > raw disks? block disks? both work.
>
> Sorry, what I forgot to tell you is that I am doing direct access at the
> IO level. This is underneath the driver. This is in the realm of
> bit-banging but with sanity.
But does this
On Tue, 17 Oct 2000, Malcolm Beattie wrote:
> Larry McVoy writes:
> > On Tue, Oct 17, 2000 at 09:21:00AM -0700, Andre Hedrick wrote:
> > > Expand 'traces' ... O-SCOPE analyizer?
> >
> > Insert a ring buffer into the disk sort entry point. Add a userland process
> > which reads this ring buffer
Larry McVoy writes:
> On Tue, Oct 17, 2000 at 09:21:00AM -0700, Andre Hedrick wrote:
> > Expand 'traces' ... O-SCOPE analyizer?
>
> Insert a ring buffer into the disk sort entry point. Add a userland process
> which reads this ring buffer and gets the actual requests in the actual order
> they
On Tue, 17 Oct 2000, Larry McVoy wrote:
> If you do all this, write a paper, Usenix loves this junk.
Sorry dyslexic.
> > How can LMbench access things that I can but a FS can not?
>
> raw disks? block disks? both work.
Sorry, what I forgot to tell you is that I am doing direct
On Tue, Oct 17, 2000 at 09:21:00AM -0700, Andre Hedrick wrote:
> On Tue, 17 Oct 2000, Larry McVoy wrote:
>
> > On Tue, Oct 17, 2000 at 11:23:30AM +0200, Vojtech Pavlik wrote:
> > > Well, I know quite well what this can bring us - with precise profiling
> > > we could see the exact geometry of
On Tue, Oct 17, 2000 at 11:23:30AM +0200, Vojtech Pavlik wrote:
> Well, I know quite well what this can bring us - with precise profiling
> we could see the exact geometry of the drive
LMbench has had something which does this for years. Look at
http://www.bitmover.com/bw.gif
On Tue, Oct 17, 2000 at 01:15:26AM -0700, Andre Hedrick wrote:
> On Tue, 17 Oct 2000, Vojtech Pavlik wrote:
>
> > > Now we can profile drives to super-charge the elevator!!
> >
> > I doubt this will ever happen. We'll see IDE drives reorder the
> > requests inside their caches sooner. The
On Tue, 17 Oct 2000, Andre Hedrick wrote:
> You do not understand the nature of what the test can generate.
> We can decode the sweep pattern now.
>
> Instead of 0->End of drive.
>
> PlatterOD->PlatterID top
> PlatterOD->PlatterID bottom.
>
> This will get us zone-profiles an determine where
On Tue, 17 Oct 2000, Vojtech Pavlik wrote:
> > Now we can profile drives to super-charge the elevator!!
>
> I doubt this will ever happen. We'll see IDE drives reorder the
> requests inside their caches sooner. The elevator will always be more
> important to get right in terms of fairness to
On Tue, Oct 17, 2000 at 12:31:42AM -0700, Andre Hedrick wrote:
>
> DiskPerf /dev/hde
> Device: Maxtor 91536H2 Serial Number: N200PGDD
> LBA 0 PIO Read Test = 5.32 MB/Sec (46.98 Seconds)
> LBA 1 PIO Read Test = 5.32 MB/Sec (46.99 Seconds)
> Outer Diameter
DiskPerf /dev/hde
Device: Maxtor 91536H2 Serial Number: N200PGDD
LBA 0 PIO Read Test = 5.32 MB/Sec (46.98 Seconds)
LBA 1 PIO Read Test = 5.32 MB/Sec (46.99 Seconds)
Outer Diameter Sequential PIO Read Test = 5.29 MB/Sec (47.24 Seconds)
Inner Diameter
DiskPerf /dev/hde
Device: Maxtor 91536H2 Serial Number: N200PGDD
LBA 0 PIO Read Test = 5.32 MB/Sec (46.98 Seconds)
LBA 1 PIO Read Test = 5.32 MB/Sec (46.99 Seconds)
Outer Diameter Sequential PIO Read Test = 5.29 MB/Sec (47.24 Seconds)
Inner Diameter
On Tue, Oct 17, 2000 at 11:23:30AM +0200, Vojtech Pavlik wrote:
Well, I know quite well what this can bring us - with precise profiling
we could see the exact geometry of the drive
LMbench has had something which does this for years. Look at
http://www.bitmover.com/bw.gif
On Tue, Oct 17, 2000 at 09:21:00AM -0700, Andre Hedrick wrote:
On Tue, 17 Oct 2000, Larry McVoy wrote:
On Tue, Oct 17, 2000 at 11:23:30AM +0200, Vojtech Pavlik wrote:
Well, I know quite well what this can bring us - with precise profiling
we could see the exact geometry of the drive
On Tue, 17 Oct 2000, Larry McVoy wrote:
If you do all this, write a paper, Usenix loves this junk.
Sorry dyslexic.
How can LMbench access things that I can but a FS can not?
raw disks? block disks? both work.
Sorry, what I forgot to tell you is that I am doing direct access at
Larry McVoy writes:
On Tue, Oct 17, 2000 at 09:21:00AM -0700, Andre Hedrick wrote:
Expand 'traces' ... O-SCOPE analyizer?
Insert a ring buffer into the disk sort entry point. Add a userland process
which reads this ring buffer and gets the actual requests in the actual order
they are
On Tue, 17 Oct 2000, Malcolm Beattie wrote:
Larry McVoy writes:
On Tue, Oct 17, 2000 at 09:21:00AM -0700, Andre Hedrick wrote:
Expand 'traces' ... O-SCOPE analyizer?
Insert a ring buffer into the disk sort entry point. Add a userland process
which reads this ring buffer and gets
On Tue, Oct 17, 2000 at 09:49:35AM -0700, Andre Hedrick wrote:
raw disks? block disks? both work.
Sorry, what I forgot to tell you is that I am doing direct access at the
IO level. This is underneath the driver. This is in the realm of
bit-banging but with sanity.
But does this give
On Tue, 17 Oct 2000, Larry McVoy wrote:
Sure, I did it over the protests of other people and I learned something,
you have every right to do the same thing. In fact, it's great that you
are doing it. Just don't get all bent out of shape if you tweaking the
elevator alg does nothing (in
As someone pointed out, the URLs I sent are wrong, they are
http://www.bitmover.com/disks/bw.gif
http://www.bitmover.com/disks/seek.gif
I forgot the disks part.
--
---
Larry McVoy lm at bitmover.com http://www.bitmover.com/lm
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