From owner-freebsd-net Wed Sep 25 13: 1:32 2002 Delivered-To: freebsd-net@freebsd.org Received: from mx1.FreeBSD.org (mx1.FreeBSD.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id CAF3337B401; Wed, 25 Sep 2002 13:01:31 -0700 (PDT) Received: from ambrisko.com (adsl-64-174-51-42.dsl.snfc21.pacbell.net [64.174.51.42]) by mx1.FreeBSD.org (Postfix) with ESMTP id 442AA43E6E; Wed, 25 Sep 2002 13:01:31 -0700 (PDT) (envelope-from ambrisko@ambrisko.com) Received: (from ambrisko@localhost) by ambrisko.com (8.11.6/8.11.6) id g8PK0Z610725; Wed, 25 Sep 2002 13:00:35 -0700 (PDT) (envelope-from ambrisko) From: Doug Ambrisko Message-Id: <200209252000.g8PK0Z610725@ambrisko.com> Subject: Re: Fwd: mbuf chain In-Reply-To: <20020925124810.B50200@iguana.icir.org> To: Luigi Rizzo Date: Wed, 25 Sep 2002 13:00:35 -0700 (PDT) Cc: Doug Ambrisko , Prafulla Deuskar , freebsd-net@FreeBSD.ORG X-Mailer: ELM [version 2.4ME+ PL94b (25)] MIME-Version: 1.0 Content-Transfer-Encoding: 7bit Content-Type: text/plain; charset=US-ASCII Sender: owner-freebsd-net@FreeBSD.ORG Precedence: bulk List-ID: List-Archive: (Web Archive) List-Help: (List Instructions) List-Subscribe: List-Unsubscribe: X-Loop: FreeBSD.org Luigi Rizzo writes: | On Wed, Sep 25, 2002 at 12:39:45PM -0700, Doug Ambrisko wrote: | ... | > Various drivers have code to deal with this when the structure | > it is putting the frags into runs out :-( See a recent bug fix to | > the ste(4) gleaned from the fxp(4). This type of problem is probably | > lurking in other drivers. Unfortunately the ste(4) driver siliently | | which suggests that we should definitely try to modify sbappend() | and/or possibly sbcompress to reduce the fragment count to reasonably | small values even in presence of very small writes. Sounds good to me. BTW a simple test is to do a "dd" of small writes over rsh/ssh. Doug A. To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-net" in the body of the message