Hello. I know its bad practice to reply to oneself, nevertheless I wanted to add more information to this: having just switched over to 2.6.19rc2, the problem has gotten worse. Now every single X <-> VT switch results in a... saa7146 (0) vpeirq: used 1 times >80% of buffer (65612 bytes now) ... msg. Sometimes I get corruptions in the mpeg stream because of this and sometimes it's just fine. Even during normal playback of a stream, those msgs appear without any load on the machine. (with 2.6.19rc2 that is) Is there anything I can do to get to the bottom of this? Thanks a lot in advance. matthew. On Saturday 14 October 2006 16:27, Matthias Dahl wrote: > Hi everyone. > > I own a KNC ONE DVB Plus with a Cineview module (Alphacrypt Light). From > the beginning I ran into data corruption problems with the mpeg stream as > soon as I made the usual X <-> VT switch or put some load on the Athlon64 > 3500+ machine with its RAID 5 (3 SATA disks). > > After some looking around, I soon discovered it was related to a buffer > underrun because the following showed up in my logs every time a corruption > occurred: > > saa7146 (0) vpeirq: used 1 times >80% of buffer (65612 bytes now) > > I searched the mailing list archives and learned this problem had been > reported earlier and that I should increase the DMA buffer size- which I > did. Running now at the maximum of 1410kb, things have pretty much been > fixed. I can put load on the machine, do random X <-> VT switches and > everything works most of the time. But there still is the occasional > underrun even though the machine is not under load. > > For example, I am running mythtv on my box for scheduling recordings. From > time to time, I get 3-4 underrun msgs in a short time (a matter of > minutes), even though nothing is recording and the machine is far from > being loaded. I don't know what mythtvbackend is doing then (maybe checking > for EPG updates from time to time). > > Here the relevant parts of my log when the dvb modules are being loaded: > > Oct 14 09:19:22 saa7146: found saa7146 @ mem ffffc20000014000 (revision 1, > irq 66) (0x1894,0x0021). > Oct 14 09:19:22 saa7146 (0): dma buffer size 1443840 > Oct 14 09:19:22 DVB: registering new adapter (KNC1 DVB-C Plus). > Oct 14 09:19:22 adapter failed MAC signature check > Oct 14 09:19:22 encoded MAC from EEPROM was > ff:ff:ff:ff:ff:ff:ff:ff:ff:ff:ff:ff:ff:ff:ff:ff:ff:ff:ff:ff > Oct 14 09:19:22 saa7146_vv: saa7146 (0): registered device video0 [v4l2] > Oct 14 09:19:22 KNC1-0: MAC addr = 00:09:d6:6d:61:b5 > Oct 14 09:19:22 DVB: registering frontend 0 (Philips TDA10021 DVB-C)... > Oct 14 09:19:22 budget-av: ci interface initialised. > Oct 14 09:19:22 budget-av: cam inserted A > Oct 14 09:19:22 dvb_ca adapter 0: DVB CAM detected and initialised > successfully > Oct 14 09:19:22 saa7146: register extension 'budget_ci dvb'. > Oct 14 09:19:35 budget-av: cam inserted A > Oct 14 09:19:36 dvb_ca adapter 0: DVB CAM detected and initialised > successfully > > If there is anything I can do to help fix or investigate this, please let > me know. I am more than willing to help... > > Have a nice weekend and thanks for any help in advance, > matthew. _______________________________________________ linux-dvb mailing list linux-dvb@xxxxxxxxxxx http://www.linuxtv.org/cgi-bin/mailman/listinfo/linux-dvb
