Date: Wed, 28 Jun 2000 22:44:08 +1000 From: Nick Slager <nicks@albury.net.au> To: Thomas Zenker <thz@Lennartz-electronic.de> Cc: scsi@FreeBSD.ORG Subject: Re: Invalidating pack messages Message-ID: <20000628224408.A63626@albury.net.au> In-Reply-To: <20000628100329.A867@mezcal.tue.le>; from thz@Lennartz-electronic.de on Wed, Jun 28, 2000 at 10:03:29AM %2B0200 References: <20000620172810.A84355@albury.net.au> <200006200754.AAA28201@salsa.gv.tsc.tdk.com> <20000621143609.A3012@albury.net.au> <200006220729.AAA07327@salsa.gv.tsc.tdk.com> <20000623173844.A51332@albury.net.au> <20000627154536.A35696@albury.net.au> <20000628100329.A867@mezcal.tue.le>
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Thus spake Thomas Zenker (thz@Lennartz-electronic.de): > On Tue, Jun 27, 2000 at 03:45:36PM +1000, Nick Slager wrote: > > In any case, it would appear there is something odd going on that involves > > write caching. I will turn write caching off again, do a 'make world', and > > hopefully the confidence factor will start to rise :-) > > Hi, having at least the same symptoms like you, I could isolate > the problem here to tagged queuing + heavy writes. It never happens > for reading only, seeks etc. So I can read the whole disk (9G) to > /dev/null without problems, but writing a big file with iozone or > dd failes very quickly. I could eliminate the problem by switching of > tagged queuing, with bad performance loss (write cache is turned off, bad > this didn't help very much), but it survives buildworlds and writes of 6G files. So far, I can't kill the thing with write caching disabled. That also has the least performance hit, so until it fails, I can live with it :-) Regards, Nick. -- From a Sun Microsystems bug report (#4102680): "Workaround: don't pound on the mouse like a wild monkey." To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-scsi" in the body of the message
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