K 10
svn:author
V 7
glebius
K 8
svn:date
V 27
2005-10-20T08:46:43.000000Z
K 7
svn:log
V 619
Revamp interrupt handling in em(4) driver:

o Do not mask the RX overrun interrupt.

o Rewrite em_intr():
  - Axe EM_MAX_INTR.
  - Cycle acknowledging interrupts and processing
    packets until zero interrupt cause register is
    read.
  - If RX overrun comes in log this fact. [ NetBSD also
    resets adapter in this case, but my tests showed that
    this is not needed and only pessimizes behavior under
    heavy load. ]
  - Since almost all functions is rewritten, style the
    remaining lines.

This fixes em(4) interfaces wedging under high load.

In collaboration with:	wpaul, cognet
Obtained from:		NetBSD

END