Date: Fri, 15 Oct 1999 14:17:41 -0600 (MDT) From: "Kenneth D. Merry" <ken@kdm.org> To: geoffb@chuggalug.clues.com (Geoff Buckingham) Cc: mjacob@feral.com (Matthew Jacob), gallatin@cs.duke.edu (Andrew Gallatin), scsi@FreeBSD.ORG Subject: Re: FreeBSD 3.2 / Slow SCSI Dell PowerEdge 4300 Message-ID: <199910152017.OAA51280@panzer.kdm.org> In-Reply-To: <19991015201103.B56536@chuggalug.clues.com> from Geoff Buckingham at "Oct 15, 1999 08:11:03 pm"
next in thread | previous in thread | raw e-mail | index | archive | help
Geoff Buckingham wrote... > > On Fri, 15 Oct 1999, Andrew Gallatin wrote: > > > >From the reports I've seen, it looks like Western Digital got their > > > act together and their Ultra2 drives are OK. Could we make the quirk > > > entry enable tagged queuing for Ultra2 WDE drives & disable it for > > > non-ultra2 drives? > > I just got this from a former colleage, details of the drives we had: > > da4 at ahc0 bus 0 target 4 lun 0 > da4: <WDIGTL WDE9180 ULTRA2 1.20> Fixed Direct Access SCSI-2 device > da4: 80.000MB/s transfers (40.000MHz, offset 31, 16bit) > da4: 8687MB (17793001 512 byte sectors: 255H 63S/T 1107C) > > In my opinion these do not require the quirk. > > (based on bonnie results for individual disks with WCE as shipped (off i think) > you get better sequential performance and more importantly for most of us > better seeking) I'd like to see some hard numbers for these before I change the quirk. (i.e. bonnie numbers at 1, 2, 4, 8, 16, 32, and 64 tags, with and without write caching) camcontrol can be used to change the tags and enable/disable write caching on the fly. If anyone wants to do this, see PR kern/10398 for an example of what sort of tests to run. In any case, it'll be a little tricky to do the quirk so it'll still match the non-Ultra2 WD drives that are apparantly still broken. (A "positive" quirk entry followed by the current quirk entry would probably do the trick, since the first matching quirk entry in the table is used.) Ken -- Kenneth Merry ken@kdm.org To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-scsi" in the body of the message
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?199910152017.OAA51280>