Re: Lost events in older kernels

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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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