From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id ; Sun, 28 Jan 2001 18:47:25 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id ; Sun, 28 Jan 2001 18:47:16 -0500 Received: from kullstam.ne.mediaone.net ([66.30.138.210]:62611 "HELO kullstam.ne.mediaone.net") by vger.kernel.org with SMTP id ; Sun, 28 Jan 2001 18:46:59 -0500 From: "Johan Kullstam" To: linux-kernel@vger.kernel.org Subject: Re: Poor SCSI drive performance on SMP machine, 2.2.16 In-Reply-To: <003f01c088fb$a35c06e0$b001a8c0@caesar> <20010128174016.3fba71ad.bruce@ask.ne.jp> <002901c08951$f751bfa0$b001a8c0@caesar> Organization: none Date: 28 Jan 2001 18:50:16 -0500 In-Reply-To: <002901c08951$f751bfa0$b001a8c0@caesar> Message-ID: User-Agent: Gnus/5.0808 (Gnus v5.8.8) Emacs/20.7 MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org "paradox3" 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" > To: "paradox3" > Cc: > 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" 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/