Date: 25 Sep 1998 12:07:44 +0200 From: rune.froysa@usit.uio.no (Rune Frøysa) To: aic7xxx Mailing List <AIC7xxx@FreeBSD.ORG> Subject: Slow SCSI under linux-2.1.123-2.aic-pre10 Message-ID: <svl4stwtsi7.fsf_-_@myrddraal.uio.no> In-Reply-To: Michael Kunze's message of "Tue, 22 Sep 1998 17:19:26 %2B0200"
next in thread | raw e-mail | index | archive | help
SCSI is slow under linux on a Dell Precision 410. /dev/sdb is a 6*9Gb
Raid0 set (connected to the scsi port on the back), which
theoretically should get somehing like 30-40MB/s. I get 9.61, which is
slower than the local disk.
scsi0 : Adaptec AHA274x/284x/294x (EISA/VLB/PCI-Fast SCSI) 5.1.0pre10/3.2.4
<Adaptec AIC-7890/1 Ultra2 SCSI host adapter>
scsi1 : Adaptec AHA274x/284x/294x (EISA/VLB/PCI-Fast SCSI) 5.1.0pre10/3.2.4
<Adaptec AIC-7880 Ultra SCSI host adapter>
scsi : 2 hosts.
Vendor: QUANTUM Model: VIKING II 9.1WLS Rev: 3506
Type: Direct-Access ANSI SCSI revision: 02
Detected scsi disk sda at scsi0, channel 0, id 0, lun 0
(scsi0:0:0:0) Synchronous at 80.0 Mbyte/sec, offset 31.
Vendor: CRD-5330 Model: UR53-600S Rev: C1-2
Type: Direct-Access ANSI SCSI revision: 02
Detected scsi disk sdb at scsi1, channel 0, id 0, lun 0
(scsi1:0:0:0) Synchronous at 40.0 Mbyte/sec, offset 8.
/local/oracle@myrddraal #hdparm -t /dev/sda
/dev/sda:
Timing buffered disk reads: 32 MB in 2.55 seconds =12.55 MB/sec
/local/oracle@myrddraal #hdparm -t /dev/sdb
/dev/sdb:
Timing buffered disk reads: 32 MB in 3.33 seconds = 9.61 MB/sec
Also, Linux started swapping a lot during mke2fs on the 54GB filesystem,
using > 120MB memory for buffers (I have 128).
--
Rune Frøysa Private e-mail: runefr@ifi.uio.no
UNIX evangelist
"Where do your encryption keys want to go today?" - Peter Gutmann
To Unsubscribe: send mail to majordomo@FreeBSD.org
with "unsubscribe freebsd-aic7xxx" in the body of the message
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?svl4stwtsi7.fsf_-_>