From owner-freebsd-current Tue Apr 17 19:21:46 2001 Delivered-To: freebsd-current@freebsd.org Received: from a.mx.everquick.net (a.mx.everquick.net [216.89.137.3]) by hub.freebsd.org (Postfix) with ESMTP id A8B3D37B43E for ; Tue, 17 Apr 2001 19:21:40 -0700 (PDT) (envelope-from eddy+public+spam@noc.everquick.net) Received: from localhost (eddy@localhost) by a.mx.everquick.net (8.10.2/8.10.2) with ESMTP id f3I2L5714802; Wed, 18 Apr 2001 02:21:05 GMT X-EverQuick-No-Abuse: Report any e-mail abuse to Date: Wed, 18 Apr 2001 02:21:04 +0000 (GMT) From: "E.B. Dreger" To: Matt Dillon Cc: Alfred Perlstein , Greg Lehey , "Justin T. Gibbs" , Doug Barton , "current @ freebsd . org" Subject: Re: Kernel preemption, yes or no? (was: Filesystem gets a huge performance boost) In-Reply-To: <200104180206.f3I268716829@earth.backplane.com> Message-ID: MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: owner-freebsd-current@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.ORG > Date: Tue, 17 Apr 2001 19:06:08 -0700 (PDT) > From: Matt Dillon > > 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