On Sun, 31 Dec 2006, Bruce Evans wrote:
[cc changed from developers to net]
On Wed, 13 Dec 2006, Bruce Evans wrote:
On Tue, 12 Dec 2006, Doug Barton wrote:
This guy's first message about this problem was very detailed, and he
seems highly motivated. Anyone want to help him out?
This might be because bge now actually reports error statistics correctly
(so the larger counts are correct, or because the fixes in -current
aren't all in RELENG_6 (so the larger and smaller counts may both be
incorrect).
I now think that this is a bug in mii (brgphy_service()) introduced
or enlarged since FreeBSD-5.early. Under loads that can be handled,
my 5701 often gets a small number of input errors every second, and
returning immediately from brgphy_service() fixes these. bge uses the
same logic as most NIC drivers for mii_tick(), and this is bad for
interrupt latency, but the problem here seems to be mangling of packets
and unrelated to interrupt latency (high loads just usually give a
packet in flight for brgphy_service() to mangle?).
More debugging showed that almost any of the reads of the phy in mii
cause an input error, and the problem is apparently not present in
FreeBSD-5.early because a bug maintaining sc->bge_link causes mii_tick()
to almost never be called. The bug seems to have been fixed in if_bge.c
1.102. FreeBSD-5.early also seems to negotiate the link a bit faster
than -current, but still too slowly.
Bruce
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