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

[Eric Anderson]

rick at snowhite.cis.uoguelph.ca wrote:
> [good stuff snipped]
> 
>>threads), but they wait until the disks are not busy.  I'm not really 
>>sure what it would give you to have the nfsd's wait until disk is not as 
>>busy, as that is what it is doing now, right?  Maybe you would smooth 
> 
> 
> The difference is that, if the nfsd threads don't take the request off
> the socket receive queue, then the TCP send window slows/stops new
> requests being sent from the client at some point.
> 
> Currently, the nfsd thread takes the request off the TCP sockets receive
> queue and then sleeps inside the VFS/VnodeOp calls.
> (As noted in the previous email, I think what happens now is good enough
>  for most cases, so long as the client doesn't retry the RPCs. I had
>  forgotten that the TCP seq# would cause TCP level retransmits to be
>  discarded, even after the request is removed from the receive queue.)

Then what happens when the socket receive queue fills up?  (Sorry if 
this is obvious).

Eric



-- 
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Eric Anderson        Sr. Systems Administrator        Centaur Technology
Anything that works is better than anything that doesn't.
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