Re: Route cache performance under stress
From: Robert Olsson <hidden>
Date: 2003-06-09 22:54:32
Possibly related (same subject, not in this thread)
- 2003-06-10 · Re: Route cache performance under stress · chas williams <hidden>
- 2003-06-10 · Re: Route cache performance under stress · David S. Miller <hidden>
- 2003-06-10 · Re: Route cache performance under stress · chas williams <hidden>
- 2003-04-05 · Re: Route cache performance under stress · Martin Josefsson <hidden>
Simon Kirby writes: > [sroot@r2:/root]# rtstat -i 1 > size IN: hit tot mc no_rt bcast madst masrc OUT: hit tot mc > 870721946 16394 1013 8 4 4 0 0 38 12 0 > 870722937 16278 1007 8 0 10 0 0 32 6 0 > ...Hmm, the size is a bit off there. I'm not sure what that's all about. Seems you have an older version of rtstat. There are stats for the GC process there too. You can get recent rtstat from: robur.slu.se:/pub/Linux/net-development/rt_cache_stat/rtstat.c I'm about to propose some stats even for hash spinning....
--- linux/include/net/route.h.orig 2003-03-24 22:59:53.000000000 +0100
+++ linux/include/net/route.h 2003-05-16 11:04:07.000000000 +0200@@ -102,6 +102,8 @@ unsigned int gc_ignored; unsigned int gc_goal_miss; unsigned int gc_dst_overflow; + unsigned int in_hlist_search; + unsigned int out_hlist_search; }; extern struct rt_cache_stat *rt_cache_stat; --- linux/net/ipv4/route.c.orig 2003-03-24 23:01:48.000000000 +0100 +++ linux/net/ipv4/route.c 2003-05-16 11:18:54.000000000 +0200
@@ -321,7 +321,7 @@ for (i = 0; i < NR_CPUS; i++) { if (!cpu_possible(i)) continue; - len += sprintf(buffer+len, "%08x %08x %08x %08x %08x %08x %08x %08x %08x %08x %08x %08x %08x %08x %08x \n", + len += sprintf(buffer+len, "%08x %08x %08x %08x %08x %08x %08x %08x %08x %08x %08x %08x %08x %08x %08x %08x %08x \n", dst_entries, per_cpu_ptr(rt_cache_stat, i)->in_hit, per_cpu_ptr(rt_cache_stat, i)->in_slow_tot,
@@ -338,7 +338,9 @@ per_cpu_ptr(rt_cache_stat, i)->gc_total, per_cpu_ptr(rt_cache_stat, i)->gc_ignored, per_cpu_ptr(rt_cache_stat, i)->gc_goal_miss, - per_cpu_ptr(rt_cache_stat, i)->gc_dst_overflow + per_cpu_ptr(rt_cache_stat, i)->gc_dst_overflow, + per_cpu_ptr(rt_cache_stat, i)->in_hlist_search, + per_cpu_ptr(rt_cache_stat, i)->out_hlist_search ); }
@@ -1771,6 +1773,7 @@ skb->dst = (struct dst_entry*)rth; return 0; } + RT_CACHE_STAT_INC(in_hlist_search); } rcu_read_unlock();
@@ -2137,6 +2140,7 @@ *rp = rth; return 0; } + RT_CACHE_STAT_INC(out_hlist_search); } rcu_read_unlock();
Cheers. --ro