On Tue, 18 Jan 2011 09:38:04 +0100, <sth...@nethelp.no> wrote:
> So, does anyone have an idea why the IP length field would be set to 0
> for these TCP/IP packets?
>
> Here's some info from Ronald w.r.t. his hardware. (All I can think of
is
> that he could try disabling TSO, etc?)
>
> Thanks in advance for any help with this, rick
>
It seems that issue came from TSO. Driver will set ip_len and
ip_sum field to 0 before passing the TCP segment to controller.
The failed length were 4446, 5858, 3034 and 4310 and the total
number of such frames are more than 35k within 90 seconds. Since
failed length 4310 is continuously repeated I guess there is edge
case where em(4) didn't free failed TCP segment for TSO.
I remember there was commit to HEAD(r217295) which could be related
with this issue.
I'm seeing the same problem with Broadcom NetXtreme (bce) cards:
bce0@pci0:3:0:0: class=0x020000 card=0x03421014 chip=0x164c14e4
rev=0x12 hdr=0x00
vendor = 'Broadcom Corporation'
device = 'Broadcom NetXtreme II Gigabit Ethernet Adapter
(BCM5708)'
class = network
subclass = ethernet
This is with 8.2-PRERELEASE. Turning off TSO (ifconfig bce0 -tso)
removes the problem.
Steinar Haug, Nethelp consulting, sth...@nethelp.no
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I tried -tso and -txcsum in various combinations, but it didn't solve the
problem. I wil look for another brand of network card to try. But this has
to wait till monday when I'm at the office again.
Ronald.
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