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Date: Fri, 09 Jan 2004 23:03:09 +0800
From: David Xu <davidxu@freebsd.org>
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To: Andre Oppermann <andre@freebsd.org>
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Subject: Re: cvs commit: src/sys/netinet ip_icmp.c tcp.h tcp_input.c
 tcp_subr.ctcp_usrreq.c tcp_var.h
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Andre Oppermann wrote:
> 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 128.0.0.1:20672, 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.
> 

Yes, it has. I temporarily reset these values to zero, now it passes all
tests.