#7 Dropped Data with HE622 ATM Cards
We have been using the HE622 Forerunner ATM cards for years with the 2.4.28 kernel with no issue. We recently updated to the CENTOS release linux 2.6.9-35. We are running a 64 bit OS.
My application is reading AAL5 packets from a piece of HW. It sometimes works great for days, but it seems that every once in a while it just stops. The atmdiag tool shows that every packet of data coming in is being dropped. I can repeat pretty easily if I load/unload the he driver. It will fail before recieving 1024 packet and the next unload/load it will run for days. I can repeat the same failure using the aread test util. I have switched boxes/cards and have the same issue, so I assume its with the OS/driver.
dmesg and /var/log/messages give a ton of
he0: HBUF_ERR! ( cid 0xf2 )
I am new to this project so if you need any more information, please let me know.
Thanks in advance for the help
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its probably taking too long to assemble a particular aal5 pdu which can cause the buffer
resupply to stall. i am working on a general fix for this problem.
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We seem to have found a fix/work around in the meantime. In the 'he' driver we change
#define CONFIG_RBPS_SIZE 1024
to
#define CONFIG_RBPS_SIZE 512
in he.h
This seemed to fix the problem, we haven't seen it since. I have to admit that I really do not undestand why this works, we noticed it was different in the 2.4.28 kernel and the 2.6.9-35 drivers, tried it and it worked. Hope this helps fix the problem. I can help you test the fix if you would like.
Thanks