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Currently the knfsd replay cache appears to try to refuse replying to
retries that come within 200ms of the cache entry being created. That
makes limited sense in today's world of high speed TCP.
After a TCP disconnection, a client can very easily reconnect and retry
an rpc in less than 200ms. If this logic drops that retry, however, the
client may be quite slow to retry again. This logic is original to the
first reply cache implementation in 2.1, and may have made more sense
for UDP clients that retried much more frequently.
After this patch we will still drop on finding the original request
still in progress. We may want to fix that as well at some point,
though it's less likely.
Note that svc_check_conn_limits is often the cause of those
disconnections. We may want to fix that some day.
Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
Acked-by: Jeff Layton <jlayton@kernel.org>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
7e5d0e0de0