Date: Sun, 16 Dec 2001 10:25:12 -0500 (EST) From: Mike Silbersack <silby@silby.com> To: <HP889@aol.com> Cc: <hackers@freebsd.org>, <isp@freebsd.org> Subject: RE: 3Com driver problems Message-ID: <Pine.BSF.4.30.0112160926580.75640-100000@niwun.pair.com> In-Reply-To: <176.cf4901.294bd7bc@aol.com>
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On Fri, 14 Dec 2001 HP889@aol.com wrote: > We dont sell ethernet drivers, and Im not trying to "hide". Why does linux > have specific code to disable the stats under load if Im making this up? Why > can you lock up a FreeBSD 4.4 system with a 3com card at 20Kpps due to > counter overflow interrupts in about 3 seconds? Well, I'm unable to lock up my -current box with a 3c905-tx (non-B or C). However, I can see the delay (apparently) caused by the stat collection routine, which was previously mentioned in the message http://docs.freebsd.org/cgi/getmsg.cgi?fetch=12982+0+archive/2001/freebsd-net/20010114.freebsd-net Interestingly enough, the delay seems to grow as I run the test longer and longer. (My test is ping -s 1400 -i .001 boxwithxlnic.) The delay seems to be able to grow to as much as 12 ms, though it's typically less, around 5 ms or so. If I switch back to the dc interface, I see no delayed packets. I see the hack you refer to in the 3c59x.c driver; I also notice that 3com's official driver (3c90x.c) doesn't contain such a workaround. They must be doing something subtly different which avoids the problem. I have a few ideas, I'll try them out next week and see what I can come up with. Mike "Silby" Silbersack To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message
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