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Path: sserve!newshost.anu.edu.au!harbinger.cc.monash.edu.au!simtel!news.kei.com!news.mathworks.com!uunet!news.va.pubnix.com!not-for-mail 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 */ /* Don't confuse my opinions with my employer's opinions! */ /* E-Mail info@va.pubnix.com for info on our shell accounts. */