linux-kernel - Re: USB performance bug since kernel 2.6.13 (CRITICAL???)

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Date:	Sat, 14 Oct 2006 01:24:52 +0100
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	Open Source <opensource3141@...oo.com>
Cc:	linux-usb-devel@...ts.sourceforge.net, linux-kernel@...r.kernel.org
Subject: Re: USB performance bug since kernel 2.6.13 (CRITICAL???)

Ar Gwe, 2006-10-13 am 16:30 -0700, ysgrifennodd Open Source:
> There is an ioctl that is waiting for the URB to be reaped.
> I am almost certain it is this syscall that is taking 4 ms (as
> opposed to 1 ms with CONFIG_HZ=1000).

What does strace say about it ? This is measurable not speculation.

> Will the first piece of code wake up immediately or only after the
> next HZ timeslice?  If it is the latter, which is what I am starting to

It depends if there are other things running and on their priority
relative to you.


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