cvs commit: src/sys/nfsclient nfs_socket.c
rwatson at FreeBSD.org
Fri Mar 24 11:03:27 UTC 2006
On Thu, 23 Mar 2006, Kris Kennaway wrote:
> Fix a bug in the NFS/TCP retransmission path.
> The bug was that earlier, if a request was retransmitted,
> we would do subsequent retransmits every 10 msecs.
> This can cause data corruption under moderate loads by reordering
> operations as seen by the client NFS attribute cache, and on the
> server side when the retransmission occurs after the original request
> has left the duplicate cache, since the operation will be committed
> for a second time.
> Further work on retransmission handling is needed (e.g. they are still
> being done sent too often since they are scaled by HZ, and the size of
> the dup cache is too small and easily overwhelmed on busy servers).
Wow. Nice catch.
Robert N M Watson
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