Date: Fri, 06 Apr 2001 10:00:50 -0700 From: Cy Schubert <cschuber@uumail.gov.bc.ca> To: Chris Dillon <cdillon@wolves.k12.mo.us> Cc: Cy Schubert - ITSD Open Systems Group <Cy.Schubert@uumail.gov.bc.ca>, freebsd-stable@FreeBSD.ORG Subject: Re: TCP New Reno algorithm Message-ID: <200104061701.f36H1fB63336@passer.osg.gov.bc.ca> In-Reply-To: Your message of "Fri, 06 Apr 2001 11:39:36 CDT." <Pine.BSF.4.32.0104061007250.63414-100000@mail.wolves.k12.mo.us>
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In message <Pine.BSF.4.32.0104061007250.63414-100000@mail.wolves.k12.mo. us>, Ch ris Dillon writes: > On Thu, 5 Apr 2001, Cy Schubert - ITSD Open Systems Group wrote: > > > Since upgrading some of our FreeBSD systems to the latest -stable, > > we've noticed that our Veritas backup throughput from the upgraded > > FreeBSD clients to our Veritas server, a Sun 450, had dropped to > > about 3 packets per second. Disabling the TCP New Reno algorithm > > (sysctl -w net.inet.tcp.newreno=0) returned our Veritas backup > > throughput to about 70 packets per second. > > I just did a quick test with Veritas NetBackup BusinesServer 3.4 > running on NT4 and FreeBSD 3.4-RC using the native FreeBSD NetBackup > client. For a particular backup set (about 450MB), with New Reno > enabled I get 3404.282KB/sec, and without New Reno I get > 3192.508KB/sec. This is a backup to a local disk on the NT4 box, not > tape, so tape throughput isn't a limiting factor. Turning off New > Reno actually hurt throughput just a little bit. The client and > server aren't on the same 100MBit Ethernet network, they're separated > by another FreeBSD 3.4-RC (New Reno enabled) box acting as a router. > Maybe you're seeing a bad New Reno interaction with Solaris itself? I might be seeing that. I'll be sending some tcpdump output to Jonathan early next week. I'm in the middle of a major Sun T3 problem. Until that is solved, my customer comes first. Regards, Phone: (250)387-8437 Cy Schubert Fax: (250)387-5766 Team Leader, Sun/Alpha Team Internet: Cy.Schubert@osg.gov.bc.ca Open Systems Group, ITSD, ISTA Province of BC To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-stable" in the body of the message
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