Date: Wed, 01 Apr 1998 18:01:01 -0800 From: "Gregory P. Smith" <greg@nas.nasa.gov> To: current@FreeBSD.ORG Subject: Re: current-digest V4 #79 Message-ID: <199804020201.SAA03945@ryouko.nas.nasa.gov> In-Reply-To: Your message of "Wed, 01 Apr 1998 15:36:40 PST." <199804012336.PAA10169@hub.freebsd.org>
next in thread | previous in thread | raw e-mail | index | archive | help
> Date: Wed, 1 Apr 1998 15:58:15 +0200 (CEST) > From: Andrzej Bialecki <abial@nask.pl> > Subject: MMX & ip checksums > > Hi! > > I've heard rumours that someone from Linux camp implemented ip checksums > using MMX extensions, which caused significant performance boost in > network operations... Can anyone confirm/deny this? If it's true, it would > be worthwhile to take a look at it... > > Andrzej Bialecki I think that would violate the Kernel's "never use floating point" rule because MMX uses the FP registers. (and on Intel's MMX implementation supposedly has a "large" context switch time between MMX and floating point mode). [Assuming MMX instructions would even be useful for the cause] Greg To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-current" in the body of the message
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?199804020201.SAA03945>