Red Hat Bugzilla – Bug 3247
Hard stop under heavy IDE/Network traffic
Last modified: 2008-05-01 11:37:50 EDT
With heavy disk usage and net activity my machine crashes.
I'm running 6.0 on a 686, 10 Gb EIDE, I forget the ethernet
card (the machine is not local, can't check at the moment)
but the driver is the epic100. This is definitely a serious
6.0 problem as 5.1 ran on the same hardware for around 8
months with no trouble whatsoever under extremely heavy
He can reproduce this by running 'hdparm -t /dev/hda' while
ping flooding the machine.
I was not able to reproduce it. It seems similar to bug
#2938, and customer tried steeping down to 386 optimization,
though he did not remove Watchdog or APM. Same results.
I was unable to get this to fail on a test lab machine containing a
Cyrix MII 300. I ping flooded the machine while running the hdparm -t
/dev/hda command. It got noticable slower but never locked up.
------- Additional Comments From 06/12/99 01:43 -------
Some info got left off of my original report below. First, another
user saw exactly the same behavior:
I don't get a reboot, the machine just locks up.
Second, doing a hdparm -d 1/dev/hda (i.e. enabling DMA)
"solves" the problem.
Third, ifconfig shows that packets are being dropped prior
to the failure. If I am ftp'ing a large file, the machine
locks, but the halt can be avoided if I continually do network
restarts during the transfer.
This is a real bug in the EPIC100 driver. It requires that interrupts
are deferred for a long time while the card receives only small
frames. The fix is in 2.2.7 or so and higher, I can provide it if