yep.. that's about normal.. you are hitting DISK preformance limits.. not
chain limits.. here's what I get on a 10k RPM disk on an alpha 600 with a
symbios card.. you are also hitting the PCI bus limit of 133MB. this is
an active box.. so the numbers are a little low :( (load is about 2 right
now)
Timing buffered disk reads: 64 MB in 3.53 seconds = 18.13 MB/sec
Timing buffer-cache reads: 128 MB in 3.06 seconds = 41.80 MB/sec
that's for normal UltraWide
this one is a K6-2 450, with a buslogic (mylex) scsi card, and a 7200 RPM
disk (i think) (backup server, no load)
Timing buffered disk reads: 64 MB in 5.54 seconds = 11.55 MB/sec
Timing buffer-cache reads: 128 MB in 3.28 seconds = 39.02 MB/sec
and finaly, a dual celeron with a 7200 RPM ide drive
Timing buffered disk reads: 64 MB in 3.47 seconds = 18.44 MB/sec
Timing buffer-cache reads: 128 MB in 1.49 seconds = 85.91 MB/sec
all drives are fairly recent (less than 1 year old) IBM ultrastars, and
IDE is a deskstar.
Thank You,
Ben Kochie (ben at nerp.net)
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"Unix is user friendly, Its just picky about its friends."
On Thu, 5 Oct 2000, Michael Josephson wrote:
> I'm running Debian (kernal 2.2.17) on a server at
> home: PIII 700 256MB ram with an Adaptec 29160 SCSI
> controller and an IBM ultra 160 hard drive. When I run
> hdparm -Tt /dev/sda, it reports:
>
> Timing buffer-cache reads: ...= 128 MB/sec
> Timing buffered disk reads: ...= 19.05 MB/sec
>
> I'm not expecting max performance, but 19 MB/sec is a
> helluva lot slower than 160 MB/sec. Anyone have any
> thoughts on this?
>
> mj
>
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