stephen mulcahy wrote:
Now some brave fouls to check the 6410 lines of this driver ? ;) Question of the day : Why TSO is broken in forcedeth ? Is it generically broken or is it broken for specific NICS ?Actually, it is only when tx-checksumming is turned off that the problem doesn't occur (so I'm not sure TSO is the problem).Additionally, a google also turns up this existing Debian bug http://bugs.debian.org/506419 which seems to be related.
As mentioned in the original Debian bug - I can reproduce this by running Hadoop[1] TeraSort[2] but I haven't identified a simpler reproducer. I tried to recreate this with iperf and ping -f but neither helped - it may be that the problem only occurs when systems are passing large amounts of traffic and have very high cpu utilisation (when running the Hadoop TeraSort all 8 cores run at 70-100% utilisation as measure with htop - I plan to instrument the nodes with something like Zabbix or Ganglia but it hasn't happened yet).
-stephen [1] http://hadoop.apache.org/[2] http://hadoop.apache.org/common/docs/current/api/org/apache/hadoop/examples/terasort/package-summary.html