Date: Tue, 15 Jul 1997 09:19:25 +0200 (MET DST) From: Luigi Rizzo <luigi@labinfo.iet.unipi.it> To: Shimon@i-Connect.Net (Simon Shapiro) Cc: smp@csn.net, hackers@FreeBSD.ORG, smp@FreeBSD.ORG Subject: Re: interrupt latency Message-ID: <199707150719.JAA12495@labinfo.iet.unipi.it> In-Reply-To: <XFMail.970715010210.Shimon@i-Connect.Net> from "Simon Shapiro" at Jul 15, 97 01:01:51 am
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> 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 perhaps 200 is too much (since any cpu stall, cache miss, etc. will hit you with a fair number of wasted cycles) but certainly 10-20 times better resolution. Luigi
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