Subject: Re: Skipping TCP / UDP / IP checksums on loopback traffic
To: None <email@example.com>
From: YAMAMOTO Takashi <firstname.lastname@example.org>
Date: 11/02/2004 11:51:49
> I'm still not aware of any real-world case where lo0 throughput is a
> significant bottleneck? Speed up something that's well under 10% of
> your application, by some 10%[*]? Not a big win.
how about something like pkgsrc/security/sfs?
anyway, a small win is good enough for this small change, IMO.
> [*] assuming all the data-touching for checksums hits in L1 CPU cache,
> after the original copyin(). Not a bad bet, given packet sizes and
> today's CPU cache sizes.
- no copyin when pages are loaned.
- not everyone runs on cpus with such "big" cache. :-)