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Newsgroups: comp.os.386bsd.bugs Path: sserve!newshost.anu.edu.au!munnari.oz.au!news.Hawaii.Edu!ames!olivea!charnel!psgrain!ee.und.ac.za!hippo.ru.ac.za!kudu!g89r4222 From: g89r4222@kudu.ru.ac.za (Geoff Rehmet) Subject: Re: ed0: warning - reciever ring buffer overflow Message-ID: <g89r4222.748636050@kudu> Sender: news@hippo.ru.ac.za (Usenet News Admin) Organization: Rhodes University, Grahamstown, South Africa References: <CDoAxI.2y6@percy.rain.com> Date: Tue, 21 Sep 1993 18:27:30 GMT Lines: 28 In <CDoAxI.2y6@percy.rain.com> davidg@percy.rain.com (David Greenman) writes: > It always surpises me that people don't just ask the original author >these questions. :-) Anyway, the reason these are happening is that the >access to the 8bit boards shared memory simply isn't fast enough to deal >with full wire speeds...but the driver tries hard...so even though packets >get dropped, your performance only drops to about what the ethernet board >is capable of (should be in the 400-600k range with an 8bit card). NFS >is especially bad because the UDP window is quite large (40k last time I >looked), so the overflow condition can happen easily. I've explained this >for the most part in the release notes for the driver, but these didn't >make it into either the FreeBSD or NetBSD releases (we couldn't find an >appropriate place to put them). Well, while everyone is moaning about David's driver, I have to say that I've been very happy with it, and I am pretty sure that since I have been using it my NFS performance has increased. (NFS read rates of up to 770K/s using 16bit SMC elite cards - faster than I can access the local IDE hard drives ;-)) Thanks for the great Driver David! Geoff. -- ============================csgr@alpha.ru.ac.za=============================== Geoff Rehmet, Parallel Processing Group, |#define DISCLAIMER These are my Computer Science Department, | ramblings, not the Rhodes University, RSA. | University's