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Date: Tue, 10 Apr 2012 12:58:00 -0400
Message-ID: <CACqU3MXo__hiKf+s31c5WFZmVO_T8mJgu4A=KkMF=MWp8VoW4w@mail.gmail.com>
From: Arnaud Lacombe <lacombar@gmail.com>
To: Alexander Motin <mav@freebsd.org>
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Cc: freebsd-hackers@freebsd.org, Florian Smeets <flo@freebsd.org>,
	Jeff Roberson <jroberson@jroberson.net>, Andriy Gapon <avg@freebsd.org>,
	FreeBSD current <freebsd-current@freebsd.org>
Subject: Re: [RFT][patch] Scheduling for HTT and not only
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Hi,

2012/4/9 Alexander Motin <mav@freebsd.org>:
> [...]
>
> I have strong feeling that while this test may be interesting for profiling,
> it's own results in first place depend not from how fast scheduler is, but
> from the pipes capacity and other alike things. Can somebody hint me what
> except pipe capacity and context switch to unblocked receiver prevents
> sender from sending all data in batch and then receiver from receiving them
> all in batch? If different OSes have different policies there, I think
> results could be incomparable.
>
Let me disagree on your conclusion. If OS A does a task in X seconds,
and OS B does the same task in Y seconds, if Y > X, then OS B is just
not performing good enough. Internal implementation's difference for
the task can not be waived as an excuse for result's comparability.

 - Arnaud