Date: Tue, 15 Jul 1997 01:02:10 -0700 (PDT) From: Simon Shapiro <Shimon@i-Connect.Net> To: Steve Passe <smp@csn.net> Cc: hackers@FreeBSD.ORG, smp@FreeBSD.ORG Subject: RE: interrupt latency Message-ID: <XFMail.970715010210.Shimon@i-Connect.Net> In-Reply-To: <199707141751.LAA02683@Ilsa.StevesCafe.com>
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Hi Steve Passe; On 14-Jul-97 you wrote: > Hi, > > Can anyone recommend a test suite/methodology for evaluating interrupt > latency? > I have some ideas for improving the (currently poor) int response of the > SMP > kernel, but need a way to determine if I am actually bettering things. > > -- > Steve Passe | powered by > smp@csn.net | Symmetric MultiProcessor FreeBSD > > I have microtime calls in the DPT driver. If I understand it correctly, on a P6-200 I could have 200 times better resolution with access to the registers in the CPU. I see interrupt latency of 0-3us with UP, and about the same with SMP, but suspect the timers resolution at these low numbers. Will be glad to acomodate. Simon
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