mirror of https://lore.kernel.org/lkml/
 help / color / mirror / Atom feed
* [ Patch ]: Fix loopback communication latency bug
@ 2005-04-19  8:03 yangyi
  2005-04-21  7:26 ` Ingo Molnar
  0 siblings, 1 reply; 2+ messages in thread
From: yangyi @ 2005-04-19  8:03 UTC (permalink / raw)
  To: Ingo Molnar; +Cc: Rt-Dev@Mvista. Com, LKML

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);

        return(0);
 }


^ permalink raw reply	[flat|nested] 2+ messages in thread
end of thread, other threads:[~2005-04-21  7:26 UTC | newest]

Thread overview: 2+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2005-04-19  8:03 [ Patch ]: Fix loopback communication latency bug yangyi
2005-04-21  7:26 ` Ingo Molnar

This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox
all inboxes | Powered by JetHome®