Messages in this thread | | | From | "Johan Kullstam" <> | Subject | Re: Poor SCSI drive performance on SMP machine, 2.2.16 | Date | 28 Jan 2001 18:50:16 -0500 |
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"paradox3" <paradox3@maine.rr.com> writes:
> I did this: > > date > dd if=/dev/zero of=TESTFILE bs=1024 count=102400 > date > sync > date > > > and I gave the time differences from the first to the last > timestamp.
hmm. i ran this on my old ppro200 with adaptec 2940uw and ibm DDRS-39130W drive.
sophia(jk)$ cat foo date dd if=/dev/zero of=TESTFILE bs=1024 count=102400 date sync sync sync date
i get
sophia(jk)$ time bash foo Sun Jan 28 18:41:52 EST 2001 102400+0 records in 102400+0 records out Sun Jan 28 18:42:11 EST 2001 Sun Jan 28 18:42:13 EST 2001
real 0m20.803s user 0m0.400s sys 0m8.780s
and this during a full kernel compile.
i get similar decent results using my other computer with a symbios 8751sp and fujitsu and seagate drives.
something must be messed up in a configuration somewhere. are you sure you are running the drive in synchronous ultra wide mode? is you termination good?
> Regards, Para-dox (paradox3@maine.rr.com) > > > > ----- Original Message ----- > From: "Bruce Harada" <bruce@ask.ne.jp> > To: "paradox3" <paradox3@maine.rr.com> > Cc: <linux-kernel@vger.kernel.org> > Sent: Sunday, January 28, 2001 2:31 PM > Subject: Re: Poor SCSI drive performance on SMP machine, 2.2.16 > > > > > > Hm. As a point of comparison, I use a similar system to yours (full SCSI, > > though, no IDE) and I can copy a 100MB file from disk-to-disk, or on the > > same disk, in around 13 seconds. Where are you copying to the SCSI drive > > from - the same drive, an IDE disk, CDROM? If IDE, what are its > > particulars? (Check with hdparm -iI /dev/hd?) > > > > -- > > Bruce Harada > > bruce@ask.ne.jp > > > > > > > > On Sun, 28 Jan 2001 12:44:29 -0500 > > "paradox3" <paradox3@maine.rr.com> wrote: > > > > > > I don't get any messages relating to the drives in any syslog output. > > > > > > > > > > > Do you get messages like the ones below in /var/log/messages? > > > > > > > > sym53c875-0-<0,0>: QUEUE FULL! 8 busy, 7 disconnected CCBs > > > > sym53c875-0-<0,0>: tagged command queue depth set to 7 > > > > > > > > In fact, do you get any messages in your log files that look like they > > > > might be related? > > > > > > - > > To unsubscribe from this list: send the line "unsubscribe linux-kernel" in > > the body of a message to majordomo@vger.kernel.org > > Please read the FAQ at http://www.tux.org/lkml/ > > > > - > To unsubscribe from this list: send the line "unsubscribe linux-kernel" in > the body of a message to majordomo@vger.kernel.org > Please read the FAQ at http://www.tux.org/lkml/
-- J o h a n K u l l s t a m [kullstam@ne.mediaone.net] Don't Fear the Penguin! - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org Please read the FAQ at http://www.tux.org/lkml/
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