On 26/11/2011 05:23, Lawrence Stewart wrote:
On 11/25/11 13:01, Lawrence Stewart wrote:
On 11/24/11 18:02, Kris Bauer wrote:
Hello,
I am currently experiencing an issue with FreeBSD 9.0-RC2 r227852
where the
net.inet.tcp.reass.curesegments value is constantly increasing (and not
descreasing when there is nominal traffic with the box). It is causing
tcp
slowdowns as described with kern/155407:
Exhausted net.inet.tcp.reass.maxsegments block recovering tcp session
(for
this socket and any other socket waiting for retransmited packets).
After
exhausted net.inet.tcp.reass.maxsegments allocation new entry in
tcp_reass
failed (for this socket and any other socket waiting for retransmited
packets).
I have increased the reass.maxsegments value to 16384 to temporarily
avoid
the problem, but the cursegments number keeps rising and it seems it
will
occur again.
Is this an issue that anyone else has seen? I can provide more
information
if need be.
Thanks Kris, Raul and Stefan for the reports, I'll look into this.
I think I've got it - a stupid 1 line logic bug. My apologies for
missing it when I reviewed the patch which introduced the bug (patch was
committed to head as r226113, MFCed to stable/9 as r226228).
Due to some miscommunication, the initial patch was committed to and
MFCed from head much later than it should have been in the 9.0 release
cycle and instead of being included in the BETAs, didn't make it in
until 9.0-RC1 I believe i.e. only RC1 and RC2 should be experiencing the
issue.
Could those who have reported the bug and are able to recompile their
kernel to test a patch please try the following and report back to the
list:
http://people.freebsd.org/~lstewart/patches/misctcp/tcp_reass_plugzoneleak_10.x.r227986.patch
The patch is against head r227986 but will apply and work correctly for
9.0 as well.
Just a me-too. Patch applied cleanly and is working fine.
Hehe... and I was blaming the Linux box at the other end of the
connection :)
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