Date: Fri, 12 May 2000 21:02:23 -0700 From: Yann Ramin <yramin@redshift.com> To: freebsd-hackers@freebsd.org Subject: Funny Network Transit Delays Message-ID: <00051221024500.06396@atp.atpn.com>
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-----BEGIN PGP SIGNED MESSAGE----- Hi there. I have an interesting problem (figured it out myself) but I'm wondering why it is occuring. I have a setup with Two FreeBSD machines (3.2 and 4.0 RELEASE), a Windows machine, and a NetBSD machine. The NetBSD machine has three 3Com 3C509/B NICs (ISA) and acts as a router to three subnets, one per machine. When I FTP something from the 4.0 to the 3.2 box, performance sucks. And not that the NetBSD machine is too slow, it seems neither the 4.0 or 3.2 is using the network like it should. Looking at the hub, I'm getting a pattern like this: Activity(3 secs) -- Pause (4 secs) -- Activity (2 secs) -- Pause (1 sec) -- Activity (7 secs) -- Pause (7 secs) and on for a total throughput of 80KB/s. The same occurs from Windows to the 4.0 box with Samba. I tried installing FreeBSD on the router, with no luck. The only solution I could come up with was to: sysctl -w net.inet.tcp.sendspace=2900 sysctl -w net.inet.tcp.recvspace=2900 This brings performance up to about 400KB/s, which is "ok" because of the extra latency of the router. I have another similar situation with two 4.0 boxes and iMacs running on two Cisco Catalyst 2924XL switches. If I use a plain vanilla 10Base hub I get a cool 620KB/s. Does anyone have any idea what is causing this? Yann -- -------------------------------------------------------------------- Yann Ramin atrus@atrustrivalie.eu.org Atrus Trivalie Productions www.atrustrivalie.eu.org irm.it.montereyhigh.com Monterey High IT www.montereyhigh.com ICQ 46805627 AIM oddatrus Marina, CA "All cats die. Socrates is dead. Therefore Socrates is a cat." - The Logician # fortune "To be responsive at this time, though I will simply say, and therefore this is a repeat of what I said previously, that which I am unable to offer in response is based on information available to make no such statement." -------------------------------------------------------------------- -----BEGIN PGP SIGNATURE----- Version: PGPfreeware 5.0i for non-commercial use MessageID: FUGyzVH4vQLKyp0A67Qx1eOXvDr2V38A iQA/AwUBORzT6jEK6loGD1TnEQK9/QCg5+2Jaxj+BzYd0JkHCPoYMRgLsVoAnjp3 8t3n4rO9Oyr+R086nXwG5Asb =/RT8 -----END PGP SIGNATURE----- To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message
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