Rafi Rubin wrote: > -----BEGIN PGP SIGNED MESSAGE----- > Hash: SHA1 > > 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. Others have experienced this too. Mika has a patch for this, increasing the (kernel) evdev buffer quite a bit, from 64 to 256. I believe the reason it is not sent upstream is because it increases the footprint by 3 Kb. Perhaps a dynamic solution could work here. Henrik -- To unsubscribe from this list: send the line "unsubscribe linux-input" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
