From: Rafi Rubin <rafi@seas.upenn.edu>
To: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Cc: linux-input <linux-input@vger.kernel.org>,
Jiri Kosina <jkosina@suse.cz>,
Henrik Rydberg <rydberg@euromail.se>
Subject: Re: Lost events in older kernels
Date: Sat, 22 May 2010 05:22:15 -0400 [thread overview]
Message-ID: <4BF7A247.5090307@seas.upenn.edu> (raw)
In-Reply-To: <20100522074249.GA25143@core.coreip.homeip.net>
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On 05/22/10 03:42, Dmitry Torokhov wrote:
> On Sat, May 22, 2010 at 03:06:07AM -0400, Rafi Rubin wrote:
>> I'm playing with a project with a 2.6.29 kernel, and the userspace application
>> seems to miss some events. Is there a particular fix that improved the handling?
>>
>> Also tried catting the dev to a file while testing, and the dump also is missing
>> some events.
>>
>
> No "interesting" patches went into evdev for a few release now...
>
> Hm, could it be that event queue is overflowing before userspace gets a
> chance to empty it. What kind of event rate are we talking here?
>
Quite possibly. It is a multitouch device and we know Henrik's been concerned
with the load for a while.
So to put some numbers behind his fears:
146668 hid events processed
24952 evdev events captured with a cat
30 seconds (give or take).
This is for a mix of different numbers of fingers, but continuous use for those
30 seconds. And X was running and reading the dev node too.
Rafi
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next prev parent reply other threads:[~2010-05-22 9:22 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-05-22 7:06 Lost events in older kernels Rafi Rubin
2010-05-22 7:42 ` Dmitry Torokhov
2010-05-22 9:22 ` Rafi Rubin [this message]
2010-05-22 10:27 ` Henrik Rydberg
2010-05-22 20:12 ` Dmitry Torokhov
2010-05-22 20:57 ` Henrik Rydberg
2010-05-22 21:08 ` Dmitry Torokhov
2010-05-22 21:26 ` Henrik Rydberg
2010-05-23 2:10 ` Rafi Rubin
2010-05-23 2:24 ` Dmitry Torokhov
2010-05-23 8:44 ` Henrik Rydberg
2010-05-24 17:48 ` Dmitry Torokhov
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