Bug 3247 - Hard stop under heavy IDE/Network traffic
Hard stop under heavy IDE/Network traffic
Product: Red Hat Linux
Classification: Retired
Component: kernel (Show other bugs)
i386 Linux
medium Severity medium
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Assigned To: David Lawrence
Depends On:
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Reported: 1999-06-03 14:08 EDT by Martin C. Messer
Modified: 2008-05-01 11:37 EDT (History)
0 users

See Also:
Fixed In Version:
Doc Type: Bug Fix
Doc Text:
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Last Closed: 1999-06-04 17:06:54 EDT
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RHEL 7.3 requirements from Atomic Host:
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Description Martin C. Messer 1999-06-03 14:08:17 EDT
Customer explains:

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
usage conditions.

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.
Comment 1 David Lawrence 1999-06-04 17:06:59 EDT
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.
Comment 2 Alan Cox 1999-06-12 09:24:59 EDT
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
need be.

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