NFS/TCP uses linear backoff when retransmiting requests but miscalculates the cut-off time for the timeout sequence resulting in premature major timeouts. The cutoff should be the sum of first retransmits+1 numbers multiplied by the timeo, not the retransmits+1 multiplied by timeo. Signed-off-by: Max Matveev <makc@xxxxxxxxxx> --- fs/nfs/client.c | 3 ++- 1 files changed, 2 insertions(+), 1 deletions(-) diff --git a/fs/nfs/client.c b/fs/nfs/client.c index 5833fbb..3d12d10 100644 --- a/fs/nfs/client.c +++ b/fs/nfs/client.c @@ -604,7 +604,8 @@ static void nfs_init_timeout_values(struct rpc_timeout *to, int proto, if (to->to_initval > NFS_MAX_TCP_TIMEOUT) to->to_initval = NFS_MAX_TCP_TIMEOUT; to->to_increment = to->to_initval; - to->to_maxval = to->to_initval + (to->to_increment * to->to_retries); + to->to_maxval = (to->to_retries + 1) * (to->to_retries + 2) / 2; + to->to_maxval *= to->to_initval; if (to->to_maxval > NFS_MAX_TCP_TIMEOUT) to->to_maxval = NFS_MAX_TCP_TIMEOUT; if (to->to_maxval < to->to_initval) -- 1.7.4.4 -- To unsubscribe from this list: send the line "unsubscribe linux-nfs" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
