Date: Sun, 21 Mar 1999 19:39:53 -0700 (MST) From: "Kenneth D. Merry" <ken@plutotech.com> To: chuckr@mat.net (Chuck Robey) Cc: joerg_wunsch@uriah.heep.sax.de, freebsd-scsi@FreeBSD.ORG Subject: Re: cvs commit: src/sys/cam cam_xpt.c Message-ID: <199903220239.TAA63860@panzer.plutotech.com> In-Reply-To: <Pine.BSF.4.10.9903212119230.430-100000@picnic.mat.net> from Chuck Robey at "Mar 21, 1999 9:25:14 pm"
index | next in thread | previous in thread | raw e-mail
Chuck Robey wrote... > On Sun, 21 Mar 1999, Kenneth D. Merry wrote: > > > > This looks quite a bit better than yours, so I'm wondering if I'd doing > > > something to skew the results? I have a 5400 RPM DCAS 34330W: > > > > Joerg did say that he was doing his test a good ways down the disk (like > > 80%). That could easily explain the difference in performance. > > > > > da1 at ncr0 bus 0 target 1 lun 0 > > > da1: <IBM DCAS-34330W S65A> Fixed Direct Access SCSI-2 device > > > da1: Serial Number F3TX1813 > > > da1: 40.000MB/s transfers (20.000MHz, offset 15, 16bit) > > > da1: 4134MB (8467200 512 byte sectors: 255H 63S/T 527C) > > > > > > This was on a 100MB bonnie test. > > > > Caching can also explain things, depending on how much RAM you've got in > > your system. > > OK, that's very likely, it's a 64M system. Would it be possible to > compile (for test only) a kernel that only recognized, say, 12M, and run > bonnie on that? Would setting MAXMEM in the kernel configuration do > that? Would 12M be a reasonable value? Should I do the test in > single-user, or multiuser? I'm offering to wedge my machine again, I > must be drinking too much coffee! > > As far as where the file sits: > > /dev/da2e 1961715 898304 906474 50% /usr/local > > as you can see, it's only half full. What might I do to make the test > more fair (as compared to Jorg's results? You don't have to decrease the amount of RAM in your system. You should just try increasing the size of the file that bonnie writes out. The -s argument allows you to specify the size of the file in megabytes. As far as where you are in the disk, well, you're 50% down that partition, which is half the size of the disk. If that's the last partition you have on the disk, you're probably about 75% down the disk, which is close to where Joerg was. > (private to Jorg: I don't know how to tickle the keyboard to get the > diuresis(sp?), I can't spell your name any closer.) I used to be able to do it by typing alt-something, but alt doesn't seem to have any effect any more. Ken -- Kenneth Merry ken@plutotech.com To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-scsi" in the body of the messagehelp
Want to link to this message? Use this
URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?199903220239.TAA63860>