Re: interesting(?) data on network interrupt servicing

From: Poul-Henning Kamp <phk_at_phk.freebsd.dk> Date: Wed, 22 Mar 2006 21:41:27 +0100 · This archive was generated by hypermail 2.4.0 : Wed May 19 2021 - 11:38:53 UTC

In message <20060322122906.A41691_at_xorpc.icir.org>, Luigi Rizzo writes:

>    if (thread)
>	isrc->is_pic->pic_disable_source(isrc, PIC_EOI);
>
>I have no idea, though, why the other pic_disable_source()
>is so expensive. The 4-5k TSC ticks are approx 3us
>
>Any clues ?

ISA bus access.

-- 
Poul-Henning Kamp       | UNIX since Zilog Zeus 3.20
phk_at_FreeBSD.ORG         | TCP/IP since RFC 956
FreeBSD committer       | BSD since 4.3-tahoe    
Never attribute to malice what can adequately be explained by incompetence.