Messages in this thread Patch in this message | | | Subject | [ Patch ]: Fix loopback communication latency bug | From | yangyi <> | Date | Tue, 19 Apr 2005 16:03:10 +0800 |
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Hi, Ingo
For the option PREEMPT_RT, local communication latency is very very big, it is about 30 to 50 times as big as the option PREEMPT_NONE as far as local ping latency is concerned. Obviously, this should be fixed ASAP.
This patch fixes this bug by changing netif_rx to netif_rx_ni in loopback device driver.
--- linux-2.6.10-orig/drivers/net/loopback.c 2005-04-19 15:12:34.000000000 +0800 +++ linux-2.6.10/drivers/net/loopback.c 2005-04-19 15:13:28.000000000 +0800 @@ -153,7 +153,7 @@ static int loopback_xmit(struct sk_buff lb_stats->tx_packets++; put_cpu();
- netif_rx(skb); + netif_rx_ni(skb);
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