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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <1160785492.25218.96.camel@localhost.localdomain>
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.


-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/