On Sat, 2007-06-23 at 08:25 -0400, Steven Rostedt wrote:
> --- linux-2.6.21.orig/net/ipv4/tcp_ipv4.c 2007-06-17 17:19:02.000000000
> +0200
> +++ linux-2.6.21/net/ipv4/tcp_ipv4.c 2007-06-17 17:20:27.000000000 +0200
> @@ -2033,7 +2033,12 @@ static void *established_get_first(struc
> struct tcp_iter_state* st = seq->private;
> void *rc = NULL;
>
> - for (st->bucket = 0; st->bucket < tcp_hashinfo.ehash_size;
> ++st->bucket) {
>
> The above is a linear search through out a very large array, where most
> of the items are NULL. I believe it was Lee that noticed this creating
> a large latency. This was back in 2.6.14. I'll check to see if this
> still is a source of latency with the latest kernels.
It looks fairly generic, is it a latency that could be fix the same way
up stream?
Daniel
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