From: Ryan K. <li...@rk...> - 2003-12-03 15:17:14
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On Sun, 30 Nov 2003 ch...@in... wrote: > Has anyone found a solution to this problem yet? I have just recently > came across what seems to be the exact same problem. I posted to the list the same day as your email, that I found disabling the sync I/O option in the UML kerenel (CONFIG_BLK_DEV_UBD_SYNC) solved my problem. > All configurations are using skas mode and tuntap networking. Both > machines have 5400 rpm IDE drives and 512mb RAM. In my configuration, the slower system had IDE and hardly showed the hangup problem, while the faster system had SCSI and significantly showed the hangup problem. Of course, if your problem is the same as mine, then it has nothing to do with disk, and instead has to do with CPU speed. Maybe a race condition exists that only faster processors hit when trying to do flushing/synchronizing of writes to the physical disk. > If I boot the Athlon host with the vanilla 2.4.21 kernel everything > performs great. I have never tested anything bug 2.4.22. Interesting it did not occur with 2.4.21. > Any suggestions on how to further isolate this problem? Well, it appears to me to be triggered by fast CPUs running 2.4.22 with the sync I/O option enabled. Beyond that, we are going to need the help of a kernel hacker. TTYL. --------------------------------------------------------------------------- | "For to me to live is Christ, and to die is gain." | | --- Philippians 1:21 (KJV) | --------------------------------------------------------------------------- | Ryan Kirkpatrick | Boulder, Colorado | http://www.rkirkpat.net/ | --------------------------------------------------------------------------- |