From owner-freebsd-hackers Wed Aug 4 19:37:40 1999 Delivered-To: freebsd-hackers@freebsd.org Received: from mail.rdc1.sfba.home.com (ha1.rdc1.sfba.home.com [24.0.0.66]) by hub.freebsd.org (Postfix) with ESMTP id 52BC914D84 for ; Wed, 4 Aug 1999 19:37:37 -0700 (PDT) (envelope-from adsharma@c62443-a.frmt1.sfba.home.com) Received: from c62443-a.frmt1.sfba.home.com ([24.0.69.165]) by mail.rdc1.sfba.home.com (InterMail v4.01.01.00 201-229-111) with ESMTP id <19990805023717.SVDH8807.mail.rdc1.sfba.home.com@c62443-a.frmt1.sfba.home.com>; Wed, 4 Aug 1999 19:37:17 -0700 Received: (from adsharma@localhost) by c62443-a.frmt1.sfba.home.com (8.9.3/8.9.3) id VAA31585; Wed, 4 Aug 1999 21:37:13 -0700 Date: Wed, 4 Aug 1999 21:37:12 -0700 From: Arun Sharma To: Dag-Erling Smorgrav Cc: freebsd-hackers@FreeBSD.ORG Subject: Re: Results of investigating optimizing calloc()... Message-ID: <19990804213712.A31563@home.com> References: <001e01bedde3$d1af64c0$291c453f@kbyanc.alcnet.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii X-Mailer: Mutt 0.95.5i In-Reply-To: ; from Dag-Erling Smorgrav on Wed, Aug 04, 1999 at 01:20:59PM +0200 Sender: owner-freebsd-hackers@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.ORG On Wed, Aug 04, 1999 at 01:20:59PM +0200, Dag-Erling Smorgrav wrote: > "Kelly Yancey" writes: > > [...] > > Which reminds me - has anyone thought of using DMA for zeroing pages, > to avoid cache invalidation? The idea is to keep a chunk of zeroes on > disk and DMA it into memory instead of clearing pages "manually". This > assumes your disk supports DMA, of course. On a Pentium III, you can use the new instructions to do page zero'ing without allocating cache lines. -Arun To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message