Strange, mine looks like this. The TX underrun counter is marked. Maybe your terminal stops after 25 lines...?
Arie S-44 SOC1 # cat /proc/net/emac_rfc2665_stats ifSpeed : 100000000 dot3StatsDuplexStatus : 3 ifAdminStatus : 1 ifOperStatus : 1 ifLastChange : 4294937879 ifInDiscards : 0 ifInErrors : 0 ifOutDiscards : 8043442 ifOutErrors : 0 ifInGoodFrames : 39789790 ifInBroadcasts : 32031783 ifInMulticasts : 537229 ifInPauseFrames : 0 ifInCRCErrors : 0 ifInAlignCodeErrors : 0 ifInOversizedFrames : 0 ifInJabberFrames : 0 ifInUndersizedFrames : 0 ifInFragments : 0 ifInFilteredFrames : 1244044334 ifInQosFilteredFrames : 0 ifInOctets : 2843366315 ifOutGoodFrames : 1300167711 ifOutBroadcasts : 2100224 your listing stops here. ifOutMulticasts : 1098977666 ifOutPauseFrames : 0 ifDeferredTransmissions : 0 ifCollisionFrames : 0 ifSingleCollisionFrames : 0 ifMultipleCollisionFrames : 0 ifExcessiveCollisionFrames : 0 ifLateCollisions : 0 ifOutUnderrun : 0 <== increments if the burst priority is 255. ifCarrierSenseErrors : 0 ifOutOctets : 521111596 if64OctetFrames : 16130590 if65To127POctetFrames : 40359478 if128To255OctetFrames : 14660289 if256To511OctetFrames : 36428177 if512To1023OctetFrames : 79018404 if1024ToUpOctetFrames : 1153360563 ifNetOctets : 1068573828 ifRxSofOverruns : 0 ifRxMofOverruns : 0 ifRxDMAOverruns : 0 S-44 SOC1 # ---------------------------------------------------------------------------- ----- Original Message ----- From: Bin Liu To: Arie de Muijnck ; [email protected] Sent: Tuesday, March 10, 2009 19-55 Subject: Re: reading compat flash causing emac network drop packets? Below is the output from the cat, /proc/net# cat ./emac_rfc2665_stats ifSpeed : 100000000 dot3StatsDuplexStatus : 3 ... ifInQosFilteredFrames : 0 ifInOctets : 1103907312 ifOutGoodFrames : 10122834 ifOutBroadcasts : 7 I can't find the TX underrun count, also from other emac_ files. Yes, I am streaming using UDP. Thanks, Bin On Mon, Mar 9, 2009 at 3:30 PM, Arie de Muijnck <[email protected]> wrote: NFS is using a TCP connection which retries after errors. I suppose you use UDP to stream video data, and then you see the errors. If you do a "cat /proc/net/emac_rfc_*" you get a list of statistics counters. Look for the TX underrun count, it should stay zero. If not then the DMA burst size is the problem. Regards, Arie de Muijnck. ----- Original Message ----- From: Bin Liu To: Arie de Muijnck Sent: Monday, March 09, 2009 16-11 Subject: Re: reading compat flash causing emac network drop packets? Thank you for the reply, I will try that out and let you know the outcome. One question in my mind is if that is the case, why nfs reading can still go through. Bin On Fri, Mar 6, 2009 at 2:55 AM, Arie de Muijnck <[email protected]> wrote: From: Bin Liu Hi, I am trying to read transport stream file from compat flash and stream out to the ethernet port, and I am using customer DM6446 board, running 2.6.10 Linux. When bitrate is low, less than 10 Mbps, there is no problem, but if bitrate goes up to anything higher than 15 Mbps, I am seeing the packet drops. So far I have made sure there is no packet drop before packet is handed over to ethernet emac driver, and the cpu usage is not very high(around 30%) when dropping packet, if I read the file from nfs server seem to be fine, so I doubt the cf driver is causing the packet drop, anybody can shad some light This is I think a known 'feature'. The maximum length of a DDRAM access burst is default set to 'infinite', meaning a low-priority access may block a high-priority DMA transfer such as used for the EMAC TX. See the errata sheet for the fix, the memory burst control register is mentioned there, the default is the special value 0xFF meaning infinite and should be set to 0x20 meaning 32. Regards, Arie de Muijnck
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