Date: Thu, 11 Sep 1997 21:11:14 +0000 (GMT) From: Terry Lambert <tlambert@primenet.com> To: mal@algonet.se (Mats Lofkvist) Cc: current@FreeBSD.ORG Subject: Re: lousy disk perf. under cpu load (was IDE vs SCSI) Message-ID: <199709112111.OAA10788@usr03.primenet.com> In-Reply-To: <199709111931.VAA01882@kairos> from "Mats Lofkvist" at Sep 11, 97 09:31:14 pm
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> The interrupt sharing of the ncr and ahc controllers indeed seemed > to be the problem. This should not be the case. The only thing I can think of is that the difference in shared vs. unshared is really abysmal for shared bacuase of the "did you generate this interrupt?" that gets asked in the shared case. I *thought* it was asked in all cases, shared or unshared, so the difference you are seeing really surprises me. You might want to volunteer to test code for Stefan, since you can apparently repeat the problem reliably. 8-(. Terry Lambert terry@lambert.org --- Any opinions in this posting are my own and not those of my present or previous employers.
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