Date: Fri, 27 Feb 1998 19:14:50 -0800 (PST) From: Curt Sampson <cjs@portal.ca> To: Mike Smith <mike@smith.net.au> Cc: Dan Janowski <danj@3skel.com>, hackers@FreeBSD.ORG Subject: Re: "Best" Fast Ethernet Card Message-ID: <Pine.NEB.3.96.980227191245.29412f-100000@cynic.portal.ca> In-Reply-To: <199802280243.SAA00310@dingo.cdrom.com>
next in thread | previous in thread | raw e-mail | index | archive | help
On Fri, 27 Feb 1998, Mike Smith wrote: > > > The question is how to measure CPU overhead, since that is the issue at > > > hand. > > > > netperf has done this for ages. > > It can measure interrupt handler execution time for just the adapter > driver? No. But you don't need that. You just need to run netperf on the same completely idle system with each network card and see the overall difference in CPU utilisation. This has the added advantage that this will catch other problems with the driver, such as having to copy due to bad alignment or things like that. (This is probably not a big deal on i386, but the Intel chipset's ability to pad the in-memory Ethernet header by a couple of bytes is a godsend on Alphas, where you generally want the IP header to be aligned.) cjs Curt Sampson cjs@portal.ca Info at http://www.portal.ca/ Internet Portal Services, Inc. Through infinite mist, software reverberates Vancouver, BC (604) 257-9400 In code possess'd of invisible folly. To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?Pine.NEB.3.96.980227191245.29412f-100000>