Date: Wed, 18 Apr 2001 02:21:04 +0000 (GMT) From: "E.B. Dreger" <eddy+public+spam@noc.everquick.net> To: Matt Dillon <dillon@earth.backplane.com> Cc: Alfred Perlstein <bright@wintelcom.net>, Greg Lehey <grog@lemis.com>, "Justin T. Gibbs" <gibbs@scsiguy.com>, Doug Barton <DougB@DougBarton.net>, "current @ freebsd . org" <current@FreeBSD.ORG> Subject: Re: Kernel preemption, yes or no? (was: Filesystem gets a huge performance boost) Message-ID: <Pine.LNX.4.20.0104180211450.14449-100000@www.everquick.net> In-Reply-To: <200104180206.f3I268716829@earth.backplane.com>
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> Date: Tue, 17 Apr 2001 19:06:08 -0700 (PDT) > From: Matt Dillon <dillon@earth.backplane.com> > > They don't have to be. If you have four NICs each one can be its own > interrupt, each with its own mutex. Thus all four can be taken in > parallel. I was under the impression that BSDI had achieved that > in their scheme. IIRC, didn't the NT driver for some NIC (Intel?) switch to polling, anyway, under heavy load? The reasoning being that you _know_ that you're going to get something... why bother an IRQ hit? That said, IRQ distribution sounds like a good thing for the general case. > If you have one NIC then obviously you can't take multiple interrupts > for that one NIC on different cpu's. No great loss, you generally don't > want to do that anyway. Actually, I should think that one would _want_ to serialize traffic for a given NIC. (I'm ignoring when one trunks NICs... speaking of which, anyone have info on 802.3ad? ;-) Otherwise, one ends up with a race that [potentially] screws up packet sequence. Eddy --------------------------------------------------------------------------- Brotsman & Dreger, Inc. EverQuick Internet / EternalCommerce Division Phone: (316) 794-8922 --------------------------------------------------------------------------- To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-current" in the body of the message
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