From: "Steinar H. Gunderson" <sgunderson@bigfoot.com>
To: Stephen Hemminger <stephen@networkplumber.org>
Cc: "bloat@lists.bufferbloat.net" <bloat@lists.bufferbloat.net>
Subject: Re: [Bloat] Hardware upticks
Date: Wed, 6 Jan 2016 01:22:13 +0100 [thread overview]
Message-ID: <20160106002213.GA8486@sesse.net> (raw)
In-Reply-To: <CAOaVG17j+SqFy=fSnByNxqQXyfWnage_P7nUL7YE9H_CsXzW7A@mail.gmail.com>
On Tue, Jan 05, 2016 at 04:06:03PM -0800, Stephen Hemminger wrote:
> The expensive part is often having to save and restore all the state in
> registers and other bits on context switch.
Are you sure? There's not really all that much state to save, and all I've
been taught before says the opposite.
Also, I've never ever seen the actual context switch turn up high in a perf
profile. Is this because of some sampling artifact?
/* Steinar */
--
Homepage: https://www.sesse.net/
next prev parent reply other threads:[~2016-01-06 0:22 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-01-05 6:37 Jonathan Morton
2016-01-05 17:42 ` Aaron Wood
2016-01-05 18:27 ` Jonathan Morton
2016-01-05 18:57 ` Dave Täht
2016-01-05 19:29 ` Steinar H. Gunderson
2016-01-05 19:37 ` Dave Täht
2016-01-05 20:13 ` David Collier-Brown
2016-01-05 20:27 ` Stephen Hemminger
2016-01-05 21:10 ` Jonathan Morton
2016-01-05 23:20 ` Steinar H. Gunderson
2016-01-05 23:17 ` Steinar H. Gunderson
2016-01-05 21:36 ` Benjamin Cronce
2016-01-06 0:01 ` Steinar H. Gunderson
2016-01-06 0:06 ` Stephen Hemminger
2016-01-06 0:22 ` Steinar H. Gunderson [this message]
2016-01-06 0:53 ` Stephen Hemminger
2016-01-06 0:55 ` Steinar H. Gunderson
2016-01-06 1:22 ` Stephen Hemminger
2016-01-06 6:18 ` Jonathan Morton
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