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Subjectre: [PATCH] new timeout behavior for RPC requests on TCP sockets
Chuck wrote:
> make RPC timeout behavior over TCP sockets behave more like reference
> client implementations. reference behavior is to transmit the same
> request three times at 60 second intervals; if there is no response, close
> and reestablish the socket connection. we modify the Linux RPC client as
> follows:
>
> + after a minor retransmit timeout, use the same timeout value when
> retrying on a TCP socket rather than doubling the value
> + after a major retransmit timeout, close the socket and attempt
> to reestablish a fresh TCP connection
>
> note that today mount uses a 6 second timeout with 5 retries for NFS over
> TCP by default; proper default behavior is 2 retries each with 60 second
> timeouts. a separate patch for mount is pending.

Chuck, can you briefly explain why RPC does any minor
retransmits at all over TCP?
Shouldn't TCP's natural retransmit take care of that?
- Dan

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