From: Mauro Carvalho Chehab <mchehab@infradead.org>
To: Andrew Morton <akpm@linux-foundation.org>
Cc: "Rafael J. Wysocki" <rjw@sisk.pl>,
Maciej Rutecki <maciej.rutecki@gmail.com>,
linux-media@vger.kernel.org
Subject: Re: [Bugme-new] [Bug 16077] New: Drop is video frame rate in kernel .34
Date: Thu, 03 Jun 2010 00:41:05 -0300 [thread overview]
Message-ID: <4C072451.7090001@infradead.org> (raw)
In-Reply-To: <20100602140916.759d7159.akpm@linux-foundation.org>
Em 02-06-2010 18:09, Andrew Morton escreveu:
> On Sun, 30 May 2010 14:29:55 GMT
> bugzilla-daemon@bugzilla.kernel.org wrote:
>
>> https://bugzilla.kernel.org/show_bug.cgi?id=16077
>
> 2.6.33 -> 2.6.34 performance regression in dvb webcam frame rates.
I don't think this is a regression. Probably, the new code is allowing a higher
resolution. As the maximum bandwidth from the sensor to the USB bridge doesn't
change, and a change from QVGA to VGA implies on 4x more pixels per frame, as
consequence, the number of frames per second will likely reduce by a factor of 4x.
I've asked the reporter to confirm what resolutions he is setting on 2.6.33
and on 2.6.34, just to double check if my thesis is correct.
Cheers,
Mauro.
next prev parent reply other threads:[~2010-06-03 3:41 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <bug-16077-10286@https.bugzilla.kernel.org/>
2010-06-02 21:09 ` [Bugme-new] [Bug 16077] New: Drop is video frame rate in kernel .34 Andrew Morton
2010-06-03 3:41 ` Mauro Carvalho Chehab [this message]
2010-06-03 7:03 ` Bjørn Mork
2010-06-03 8:41 ` Hans de Goede
2010-06-03 8:51 ` Bjørn Mork
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