FreeBSD NFS server not responding to TCP SYN packets from Linux/SunOS clients

[Brooks Davis]

On Fri, Oct 14, 2005 at 12:21:22PM -0400, Jim Rees wrote:
>   ps: It would be nice if someone with the right expertise could explore
>       other things in TCP specifically for NFS. For example, I don't see
>       why a retransmit timeout should go above about 100msec
> 
> nfs/rpc shouldn't retransmit at all over tcp except when there has been a
> reconnect.  Tcp might retransmit, but modern implementations will always
> choose the right timeout dynamically, unless packet loss is excessive.

That's not entierly true.  I was talking to someone from Panasas last
fall who was lamenting the lack of sub millisecond timeout support in
the kernel because on a Gigabit Ethernet LAN, you can expect a response
in less than 1ms and essentily all failures to respond in that time are
caused by packet corruption or overflowing switch buffers.

-- Brooks

-- 
Any statement of the form "X is the one, true Y" is FALSE.
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