cvs commit: src/sys/netinet ip_icmp.c tcp.h tcp_input.c tcp_subr.ctcp_usrreq.c tcp_var.h

silby at silby at
Fri Jan 9 06:25:23 PST 2004

> David Xu wrote:
>> I got following messages when I am running mysql stress test suite,
>> and the test can not be completed.
>> "too many small tcp packets from, av. 91byte/packet,
>> dropping connection"
> You can set net.inet.tcp.minmssoverload to a higher value than the
> default of 1,000.  I suggest trying with 2,000 as next step and see if
> it still overloads.
> Appearently my default of 1,000 pps is fine for normal use but too low
> for some edge cases.
> Could you check the MySQL source code if it has a setsockopt() setting
> the TCP_NODELAY option?  That would help to explain a lot.
> --
> Andre

This might nerf the protection a bit, but could reduce the packet counter
once for each socket write the local machine does?  That should protect
chatty applications, but still detect those that are just flooding data to
a bulk service like ftp or smtp.

Mike "Silby" Silbersack

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