I'm noticing on a moderately loaded system, that sometimes when the kernel increases the TX threshold (/kernel: dc0: TX underrun -- increasing TX threshold), a few minutes later, the system hardlocks requiring a reset. This routinely happens when I'm streaming MP3s over the network and the box suddenly hardlocks; after I go back to inspect the logs, the TX buffer underrun is the only thing in the log before the start of the kernel reboot messages. This is occuring on 4.8-STABLE as of July 7, 2003 on an AMD K6-2 500 with 348 Mb RAM and VIA Apollo MVP3 chipset. When the lockups occur, the system temperatures are below 40C, with little disk activity, moderate ram and cpu usage; the NIC (linksys LNE-100TX A) is usually doing a steady 50K/s at this point. -- Peter C. Lai University of Connecticut Dept. of Molecular and Cell Biology Yale University School of Medicine SenseLab | Research Assistant http://cowbert.2y.net/
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