Re: SCSI driver sppeds
Svante Signell [svante.signell@telia.com] wrote:
> Hello Debianers,
>
> When running kernel-2.4.0 SCSI disk speed is reported at boot time
> to synchronous at 40MB/s (bios setting), and measured to 19.2 MB/s
> using hdparm -t /dev/sda. However, when booting kernels 2.4.7 and
> 2.4.12 speed is going down to reported 11.6 MB/s and measured 9.4
> MB/s.
>
> Tagged Command Queueing is reported enabled on kernels-2.4.7,2.4.12,
> not on 2.4.0. How to disable at boot and in .config if this is causing
> the slowdown?
>
> I'm running Debian/unstable, kernels are compiled by hand, using make-kpkg.
> sda is an IBM 8GB DDRS-39130D with a main board controller AIC-7895.
>
> Svante
It might just be your hardware.
sym53c895-0-<6,*>: FAST-20 WIDE SCSI 40.0 MB/s (50.0 ns, offset 31)
SCSI device sdd: 35843670 512-byte hdwr sectors (18352 MB)
/dev/sdd:
Timing buffered disk reads: 64 MB in 2.41 seconds = 26.56 MB/sec
lawrence@the-penguin:~$ uname -a
Linux the-penguin 2.4.12-ac3 #2 Tue Oct 16 12:20:46 PDT 2001 i686 unknown
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