From: Andi Kleen <ak@suse.de>
To: "Cestonaro,
Thilo (external)" <Thilo.Cestonaro.external@fujitsu-siemens.com>
Cc: linux-kernel@vger.kernel.org
Subject: Re: Weird wasting of time between ioctl() and ioctl dispatcher
Date: 27 Nov 2006 12:10:33 +0100 [thread overview]
Message-ID: <p73r6vpdu1i.fsf@bingen.suse.de> (raw)
In-Reply-To: <F7F9B0BE3E9BD449B110D0B1CEF6CAEF03FA5863@ABGEX01E.abg.fsc.net>
"Cestonaro, Thilo \(external\)" <Thilo.Cestonaro.external@fujitsu-siemens.com> writes:
> I'm a developer for Fujitsu Siemens Computers, working on a program which has it's own kernel modules and userland components.
> Now cause the program should be released we have done some testing and during this testphase a wierd wasting of time occured
> during the call of the ioctl() in the userland component and the actuall entering of the dispatcher function in the module.
> It takes 3 min. until the call at last enters my dispatcher.
Something else is holding the big kernel lock for that long. Most likely
it's your own code. Consider using a ->unlocked_ioctl
-Andi
prev parent reply other threads:[~2006-11-27 11:10 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-11-27 8:24 Cestonaro, Thilo (external)
2006-11-27 8:50 ` Arjan van de Ven
2006-11-27 11:10 ` Andi Kleen [this message]
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