cvs commit: src/sys/dev/em if_em.c

[Gleb Smirnoff]

On Tue, Aug 22, 2006 at 02:32:48AM +0000, Pyun YongHyeon wrote:
P> yongari     2006-08-22 02:32:48 UTC
P> 
P>   FreeBSD src repository
P> 
P>   Modified files:
P>     sys/dev/em           if_em.c 
P>   Log:
P>   It seems that em(4) misses Tx completion interrupts under certain
P>   conditions. The cause of missing Tx completion interrupts comes from
P>   Tx interrupt moderation mechanism(delayed interrupts) or chipset bug.
P>   If Tx interrupt moderation mechanism is the cause of false watchdog
P>   timeout error we should have to fix all device drivers that have Tx
P>   interrupt moderation capability. We may need more investigation
P>   for this issue. Anyway, the fix is the same for both cases.
P>   
P>   This should fix occasional watchdog timeout errors seen on a few
P>   systems.
P>   
P>   Reported by:    -net, Patrick M. Hausen < hausen AT punkt DOT de >
P>   Tested by:      Patrick M. Hausen < hausen AT punkt DOT de >

This look like a workaround, not a fix the root of the problem. Several
people on net said that this problem disappears if debug.mpsafenet=0.
So I think there is a problem in FreeBSD or driver, not in chip.

-- 
Totus tuus, Glebius.
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