Messages in this thread | | | Date | Wed, 4 Jun 1997 16:09:28 -0700 (PDT) | From | Dean Gaudet <> | Subject | Re: pre-patch-2.0.31 try_to_free_page() messages |
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On Sun, 1 Jun 1997 tytso@mit.edu wrote: > There are known interrupt latency problems that cause characters to be > dropped by the UART, before the serial driver has a chance to get the > characters. This was intential due to some broken IDE controllers that > could cause MASSIVE FILESYSTEM DAMAGE if the problem was not worked > around.
I've been running the Interrupt+Serial+Overrun patch from <http://mosquitonet.Stanford.EDU/software/LinuxChanges.html> and I've been using hdparm -u 1, and I still get overruns. Not nearly as many, but I still do get overruns. Granted, Stuart's patch changes serial handling greatly, so this may not be entirely true of the standard kernel. But I highly suspect it is still true of the standard kernel.
This is at 115200 on a thinkpad 560 with a megahertz pcmcia modem.
Does the 2.1 plan include integrating the RT-Linux code? I heard that a while back, but I'm not sure it's the case. If so that can be used to help this situation a lot.
Dean
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