On Mon, Jan 28, 2013 at 09:59:18PM +0100, Soeren Moch wrote: > On 23.01.2013 19:10, Andrew Lunn wrote: > >>>> > >>> > >>>Now (in the last hour) stable, occasionally lower numbers: > >>>3396 3396 3396 3396 3396 3396 3396 3396 3396 3396 3396 3396 3396 3396 > >>>3396 3396 3396 3396 3396 3396 3396 3396 3396 3396 3396 3396 3396 3396 > >>>3396 3396 3396 3396 3396 3396 3396 3396 3396 3396 3396 3396 3396 3396 > >>>3396 3396 3396 3396 3396 3396 3396 3396 3396 3365 3396 3394 3396 3396 > >>>3396 3396 3373 3396 3396 3396 3396 3396 3396 3396 3396 3396 3396 3396 > >>>3396 3353 3396 3396 3396 3396 3396 3396 3396 3396 3396 3396 3396 3396 > >>>3394 3396 3396 3396 3396 3396 3396 3396 > >>> > >>>Before the last pool exhaustion going down: > >>>3395 3395 3389 3379 3379 3374 3367 3360 3352 3343 3343 3343 3342 3336 > >>>3332 3324 3318 3314 3310 3307 3305 3299 3290 3283 3279 3272 3266 3265 > >>>3247 3247 3247 3242 3236 3236 > >>> > >>Here I stopped vdr (and so closed all dvb_demux devices), the number > >>was remaining the same 3236, even after restart of vdr (and restart > >>of streaming). > > > >So it does suggest a leak. Probably somewhere on an error path, > >e.g. its lost video sync. > > > > Now I activated the debug messages in em28xx. From the messages I > see no correlation of the pool exhaustion and lost sync. Also I > cannot see any error messages from the em28xx driver. > I see a lot of init_isoc/stop_urbs (maybe EPG scan?) without > draining the coherent pool (checked with 'cat > /debug/dma-api/num_free_entries', which gave stable numbers), but > after half an hour there are only init_isoc messages without > corresponding stop_urbs messages and num_free_entries decreased > until coherent pool exhaustion. > > Any idea where the memory leak is? What is allocating coherent > buffers for orion-ehci? Keeping in mind that I am completely unfamiliar with usb dvb, my best guess is that the problem is in em28xx-core.c:1131 According to your log messages, it is in mode 2, which is EM28XX_DIGITAL_MODE. There seem to be good hints in 86d38d1e [media] em28xx: pre-allocate DVB isoc transfer buffers I added the relevant parties to the To:... For Gianluca and Mauro, the whole thread may be found at: http://markmail.org/message/wm4wlgzoudixd4so#query:+page:1+mid:o7phz7cosmwpcsrz+state:results thx, Jason. > > Soeren > > > Jan 28 20:46:03 guruvdr kernel: em28xx #0/2-dvb: Using 5 buffers > each with 64 x 940 bytes > Jan 28 20:46:03 guruvdr kernel: em28xx #0 em28xx_init_isoc :em28xx: > called em28xx_init_isoc in mode 2 > Jan 28 20:46:03 guruvdr kernel: em28xx #1/2-dvb: Using 5 buffers > each with 64 x 940 bytes > Jan 28 20:46:03 guruvdr kernel: em28xx #1 em28xx_init_isoc :em28xx: > called em28xx_init_isoc in mode 2 > Jan 28 20:46:23 guruvdr kernel: em28xx #0 em28xx_stop_urbs :em28xx: > called em28xx_stop_urbs > Jan 28 20:46:23 guruvdr kernel: em28xx #1 em28xx_stop_urbs :em28xx: > called em28xx_stop_urbs > Jan 28 20:46:24 guruvdr kernel: em28xx #0/2-dvb: Using 5 buffers > each with 64 x 940 bytes > Jan 28 20:46:24 guruvdr kernel: em28xx #0 em28xx_init_isoc :em28xx: > called em28xx_init_isoc in mode 2 > Jan 28 20:46:24 guruvdr kernel: em28xx #1/2-dvb: Using 5 buffers > each with 64 x 940 bytes > Jan 28 20:46:24 guruvdr kernel: em28xx #1 em28xx_init_isoc :em28xx: > called em28xx_init_isoc in mode 2 > Jan 28 20:46:44 guruvdr kernel: em28xx #1 em28xx_stop_urbs :em28xx: > called em28xx_stop_urbs > Jan 28 20:46:44 guruvdr kernel: em28xx #0 em28xx_stop_urbs :em28xx: > called em28xx_stop_urbs > Jan 28 20:46:45 guruvdr kernel: em28xx #1/2-dvb: Using 5 buffers > each with 64 x 940 bytes > Jan 28 20:46:45 guruvdr kernel: em28xx #1 em28xx_init_isoc :em28xx: > called em28xx_init_isoc in mode 2 > Jan 28 20:46:45 guruvdr kernel: em28xx #0/2-dvb: Using 5 buffers > each with 64 x 940 bytes > Jan 28 20:46:45 guruvdr kernel: em28xx #0 em28xx_init_isoc :em28xx: > called em28xx_init_isoc in mode 2 > Jan 28 20:54:33 guruvdr kernel: ERROR: 1024 KiB atomic DMA coherent > pool is too small! > Jan 28 20:54:33 guruvdr kernel: Please increase it with > coherent_pool= kernel parameter! > -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>