From owner-freebsd-net Sat Mar 16 18:11:22 2002 Delivered-To: freebsd-net@freebsd.org Received: from medusa.oit.pdx.edu (medusa.oit.pdx.edu [131.252.120.41]) by hub.freebsd.org (Postfix) with ESMTP id 248B437B405 for ; Sat, 16 Mar 2002 18:11:18 -0800 (PST) Received: from gere.odin.pdx.edu (gere.odin.pdx.edu [131.252.120.42]) by medusa.oit.pdx.edu (8.11.6/8.11.6) with ESMTP id g2H2BG818916; Sat, 16 Mar 2002 18:11:16 -0800 (PST) Received: from localhost (singh@localhost) by gere.odin.pdx.edu (8.11.6/8.11.6) with ESMTP id g2H2BF805885; Sat, 16 Mar 2002 18:11:15 -0800 (PST) X-Authentication-Warning: gere.odin.pdx.edu: singh owned process doing -bs Date: Sat, 16 Mar 2002 18:11:15 -0800 (PST) From: Harkirat Singh X-X-Sender: To: Julian Elischer Cc: Luigi Rizzo , Mike Silbersack , Brian White , Subject: Re: SACK (and older TCP stack) availability? In-Reply-To: Message-ID: MIME-Version: 1.0 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 Hello, I am sorry due to some reasons I have not been able to check this mail account in the past. I faced problem in validation of Implementation due to lack of efficient tools, I used wireless bed so by default tcpdump (at wi0 interface) was in promiscuous-mode and one packet was dumped appx three times. I used Ostermann's tcptrace and tcpdump and then did a packet by pkt trace, SACK was behaving as desirable. However, I wish if there would have been more efficient tool. I also verified implementation in a wireless testbed of 3 hop network and using Dummynet for creating reorder, loss, delay etc..(many thanks to Rizzo for such a magnificent tool!). SACK showed higher thruput than Reno and Newreno under various test conditions. I was doing an Energy performance of Reno, NewReno and SACK part of my thesis and I used kernel.GENERIC (FreeBSD4.3) for reno and NewReno. Please let me know if I can be of any of help. Regards, Harkirat On Thu, 21 Feb 2002, Julian Elischer wrote: > tehn we need to tell teh author.. > he seems to want then to be used . I'm sure he'd be reponsive to being > told about the problems.. > > > On Thu, 21 Feb 2002, Luigi Rizzo wrote: > > > On Thu, Feb 21, 2002 at 01:54:20AM +0000, Mike Silbersack wrote: > > > > > > > I tracked a thread from Aug 2001 in which Harkirat Singh announced his > > > > SACK implementation. But, this thread seems to have ended prematurely and > > > > grep'ing for SACK in current does not turn up anything interesting. What > > > > is it's status? Was the 4.3 SACK diff stable? > > > > > > I never got time to test it, nor did any other committer I'm aware of. > > > If someone were to do some good testing of the patch and post the results, > > > that would be highly helpful in getting it on the road to being committed. > > > Unadvocated patches ususally don't get committed. > > > > I actually looked at the patches, and by visual inspection, > > they broke the flow for standard TCP connections when SACK > > was disabled. This was also verified with TBIT. > > So even if the SACK implementation was correct > > (which I haven't checked in detail) they are a no-go > > unless someone puts significant work on them. > > > > cheers > > luigi > > ----------------------------------+----------------------------------------- > > Luigi RIZZO, luigi@iet.unipi.it . ICSI (on leave from Univ. di Pisa) > > http://www.iet.unipi.it/~luigi/ . 1947 Center St, Berkeley CA 94704 > > Phone: (510) 666 2927 > > ----------------------------------+----------------------------------------- > > > > To Unsubscribe: send mail to majordomo@FreeBSD.org > > with "unsubscribe freebsd-net" in the body of the message > > > > > To Unsubscribe: send mail to majordomo@FreeBSD.org > with "unsubscribe freebsd-net" in the body of the message > To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-net" in the body of the message