*BSD News Article 44778


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From: lidl@va.pubnix.com (Kurt J. Lidl)
Newsgroups: comp.unix.bsd.freebsd.misc
Subject: Re: Was: ISP , now: How Using FBSD?
Date: 31 May 1995 18:41:22 -0400
Organization: AlterNet -- Falls Church, Virginia, USA
Lines: 52
Message-ID: <3qirai$kaa@arrow.va.pubnix.com>
References: <3pqb92$lq2@pt9201.ped.pto.ford.com> <3puu0i$nqi@shell1.best.com> <3q4tnq$loa@arrow.va.pubnix.com> <3qhdbo$4hd@shell1.best.com>
NNTP-Posting-Host: arrow.va.pubnix.com

In article <3qhdbo$4hd@shell1.best.com>, Matt Dillon <dillon@best.com> wrote:
>:In article <3q4tnq$loa@arrow.va.pubnix.com>,
>:Kurt J. Lidl <lidl@va.pubnix.com> wrote:
>:>In article <3puu0i$nqi@shell1.best.com>, Matt Dillon <dillon@best.com> wrote:
>:>>    FreeBSD beats the hell out of BSDI when it comes 
>:>>    to SCSI throughput, especially with those cheap $70 NCR PCI SCSI cards.  
>:>
>:>Post numbers, I don't believe it.
>
>    BSDI is still using a very, very old SCSI subsystem as far as I
>    can tell.  The best I can get out of our BSDI system on a good day 
>    is on the order of 1.2 MBytes/sec writing and about the same reading.
>    That's with a PCI Buslogic SCSI card on a 90 MHz pentium machine.

I got it a bit better than that under BSDi v1.1, using Adaptec 1742
controllers and DEC 2GB drives (it was around 1.5 MB/sec reading,
and 1.2 MB/sec writing).


>    The FreeBSD machine, identical except that it uses an NCR PCI SCSI
>    card, with similar loading (very low) gets 3.3 MBytes/sec
>    writing and 6.5 MBytes/sec reading.  Both machines with 4G baracuda's,
>    the testing done on a reasonably unloaded partition.

Using the same dd test that you did, I get about 80% of writing
speeds you reported using an NCR 810 on-board SCSI2 controller on
my DECpc XL590, writing to a 1GB HP drive:

root@arrow-82: dd if=/dev/zero of=test bs=32k count=2048
2048+0 records in
2048+0 records out
67108864 bytes transferred in 26 secs (2581110 bytes/sec)

My reading time are somewhat lower than yours (about 50% of your
reported speeds), at least on this controller/drive combination:

root@arrow-85: dd if=test of=/dev/null bs=32k count=2048
2048+0 records in
2048+0 records out
67108864 bytes transferred in 20 secs (3355443 bytes/sec)

Are those baracuda 16bit or 8bit SCSI drives?

The HP's I've got are definately 8bit.  Seeing how my HP drive is
only rated at 4MB/sec off the platters, I cannot complain about
the throughput I'm seeing.

-Kurt
-- 
/* Kurt J. Lidl (lidl@va.pubnix.com) UUCP: <ANYWHERE>!uunet!lidl */
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