On 08/18/15 14:53, Rick Macklem wrote:
If this is just a test machine, maybe you could test with these lines (at about
#880)
in sys/netinet/tcp_output.c commented out? (It looks to me like this will
disable TSO
for almost all the NFS writes.)
- around line #880 in sys/netinet/tcp_output.c:
/*
* In case there are too many small fragments
* don't use TSO:
*/
if (len <= max_len) {
len = max_len;
sendalot = 1;
tso = 0;
}
This was added along with the other stuff that did the if_hw_tsomaxsegcount,
etc and I
never noticed it until now (not my patch).
FYI:
These lines are needed by other hardware, like the mlxen driver. If you
remove them mlxen will start doing m_defrag(). I believe if you set the
correct parameters in the "struct ifnet" for the TSO size/count limits
this problem will go away. If you print the "len" and "max_len" and also
the cases where TSO limits are reached, you'll see what parameter is
triggering it and needs to be increased.
--HPS
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