Date: Tue, 9 Sep 1997 12:15:44 -0700 (PDT) From: Tom <tom@uniserve.com> To: Terry Lambert <tlambert@primenet.com> Cc: Mats Lofkvist <mal@algonet.se>, current@freebsd.org Subject: Re: lousy disk perf. under cpu load (was IDE vs SCSI) Message-ID: <Pine.BSF.3.96.970909121004.21474A-100000@shell.uniserve.com> In-Reply-To: <199709091834.LAA28493@usr04.primenet.com>
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On Tue, 9 Sep 1997, Terry Lambert wrote: > > But can lack of tagged command queueing explain the combination of good > > performance unloaded and bad with one or more cpu bound processes? > > Yes, I believe so: swapping. But you need to know for sure if it > is supported in your version, and I'm not the one to ask. Look > at the archives, or wait for Stefan to post. The NCR driver has supported tags for a LONG time, probably since before 2.1 The ahc driver has supported tages for a LONG time, since about 2.1.5 ... > > PS How do I find out if tagged queueing is supported? Maybe time > > to try -current? > > Look in the archives or look in the archives to get Stefan's address, > and ask him. Or if you CVSup/CTM code, look at the CVS logs. "ncrcontrol" for the NCR driver. Also, see ncrcontrol man page. The ahc driver lists tag support during boot. Also see ahc man page. > Terry Lambert > terry@lambert.org > --- > Any opinions in this posting are my own and not those of my present > or previous employers. > Tom
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