Date: Wed, 28 Nov 2001 20:07:38 +1100 From: "Chris Knight" <chris@aims.com.au> To: "'Nate Williams'" <nate@yogotech.com> Cc: <freebsd-hackers@freebsd.org> Subject: RE: FreeBSD performing worse than Linux? Message-ID: <003b01c177ec$21e7c870$020aa8c0@aims.private> In-Reply-To: <15364.38767.82340.347344@caddis.yogotech.com>
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Howdy, I had a similar problem, especially with different FreeBSD 4.x boxes (4.1.1, 4.2, 4.3, 4.4-stable after dirpref merge) and with Windows NT systems, but the crap performance was only limited to FTP. SSH, NFS and CVS operations were all fine. The pre-4.3 boxes are all using RTL8029 cards, and the 4.3+ boxes are all Intel 8255x-based cards. The laptop has 4.4-stable and a D-Link DFE-650. The poor performance showed up in interactions with the 100Mbit/s cards (Intel, D-Link). They have all disappeared since I've explicitly set the links to 100Mbit/s with full-duplex. The switches and hubs are all 10/100 D-Links. My guess is that the autonegotiation feature of both the fxp and ed drivers somehow adversely affects FTP. However this is only surmise. My fix was based more on an inspired guess than methodical practice and I didn't get the opportunity to delve deeper into the reasons for the problem. Sometimes the real world can be a pain :-) Regards, Chris Knight Systems Administrator AIMS Independent Computer Professionals Tel: +61 3 6334 6664 Fax: +61 3 6331 7032 Mob: +61 419 528 795 Web: http://www.aims.com.au > -----Original Message----- > From: owner-freebsd-hackers@FreeBSD.ORG > [mailto:owner-freebsd-hackers@FreeBSD.ORG]On Behalf Of Nate Williams > Sent: Wednesday, 28 November 2001 18:51 > To: Poul-Henning Kamp > Cc: Nate Williams; Greg Lehey; developers@FreeBSD.ORG; FreeBSD Hackers > Subject: Re: FreeBSD performing worse than Linux? > > > > >Note, some of the performance issues were made better by > disabling the > > >TCP newreno implementation, but it's still poor and very > inconsistent > > >for hosts not on the local network, while the Linux box > next to it gets > > >much more consistent results. > > > > For what it's worth I have disabled newreno at my customer > sites as well > > and felt and heard less "bogosity" since. > > It's actually pretty awful. However, even with the fix I merged back > into RELENG_4, the performance with/without newreno is still *much* > worse (in terms of consistantly giving the same results) than the code > in FreeBSD 3.x. > > The interesting thing is that the application that's getting the most > press is one of our field technicians downloading a file over > anonymous > ftp by hand, so it's not like we're generating tons of traffic, or > alot of parallel connections. > > The connections hang, abort, and those that complete have numbers that > are *all* over the map. However, when connected to a Linux box on the > same network, none of these bad things occur. :( > > (And, we've verified the network is up by running ping in another > window.) > > > > > Nate > > To Unsubscribe: send mail to majordomo@FreeBSD.org > with "unsubscribe freebsd-hackers" in the body of the message > To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message
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