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 t= he 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 t= his: 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 luc= k. The only solution I could come up with was to: sysctl -w net.inet.tcp.sendspace=3D2900 sysctl -w net.inet.tcp.recvspace=3D2900 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 box= es 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=09=09=09atrus@atrustrivalie.eu.org Atrus Trivalie Productions=09www.atrustrivalie.eu.org =09=09=09=09irm.it.montereyhigh.com Monterey High IT=09=09www.montereyhigh.com ICQ =09=09=09=0946805627 AIM=09=09=09=09oddatrus Marina, CA "All cats die. Socrates is dead. Therefore Socrates is a cat." =09- The Logician =09# 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 =3D/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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