drbd: improve network latency, TCP_QUICKACK
On Thu, Apr 29, 2010 at 04:00:50PM -0400, Eduard.Guzovsky@stratus.com wrote on drbd-dev@lists.linbit.com Subject: [Drbd-dev] DRBD small synchronous writes performance improvements > 1. TCP_QUICKACK option is set incorrectly. The goal was force TCP to > send and ACK as a "one time" event. Instead the code permanently sets > connection in the QUICKACK mode. He is right, we actually want to use an even val with TCP_QUICKACK. Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com> Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com> Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
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@ -1540,7 +1540,7 @@ static inline void drbd_tcp_nodelay(struct socket *sock)
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static inline void drbd_tcp_quickack(struct socket *sock)
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{
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int __user val = 1;
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int __user val = 2;
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(void) drbd_setsockopt(sock, SOL_TCP, TCP_QUICKACK,
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(char __user *)&val, sizeof(val));
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}
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