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Date: Sun, 06 Nov 2011 16:57:22 +0100 From: Paweł Staszewski <pstaszewski@...are.pl> To: Linux Network Development list <netdev@...r.kernel.org>, Eric Dumazet <eric.dumazet@...il.com> Subject: Linux Route Cache performance tests Hello I make some networking performance tests for Linux 3.1 Configuration: Linux (pktget) ----> Linux (router) ----> Linux (Sink) pktgen config: clone_skb 32 pkt_size 64 delay 0 pgset "flag IPDST_RND" pgset "dst_min 10.0.0.0" pgset "dst_max 10.18.255.255" pgset "config 1" pgset "flows 256" pgset "flowlen 8" TX performance for this host: eth0: RX: 0.00 P/s TX: 12346107.73 P/s TOTAL: 12346107.73 P/s On Linux (router): grep . /proc/sys/net/ipv4/route/* /proc/sys/net/ipv4/route/error_burst:500 /proc/sys/net/ipv4/route/error_cost:100 grep: /proc/sys/net/ipv4/route/flush: Permission denied /proc/sys/net/ipv4/route/gc_elasticity:4 /proc/sys/net/ipv4/route/gc_interval:60 /proc/sys/net/ipv4/route/gc_min_interval:0 /proc/sys/net/ipv4/route/gc_min_interval_ms:500 /proc/sys/net/ipv4/route/gc_thresh:2000000 /proc/sys/net/ipv4/route/gc_timeout:60 /proc/sys/net/ipv4/route/max_size:8388608 /proc/sys/net/ipv4/route/min_adv_mss:256 /proc/sys/net/ipv4/route/min_pmtu:552 /proc/sys/net/ipv4/route/mtu_expires:600 /proc/sys/net/ipv4/route/redirect_load:2 /proc/sys/net/ipv4/route/redirect_number:9 /proc/sys/net/ipv4/route/redirect_silence:2048 For the first 30secs maybee more router is forwarding ~5Mpps to the Linux (Sink) and some stats for this forst 30secs in attached image: http://imageshack.us/photo/my-images/684/test1ih.png/ Left up - pktgen linux left down - Linux router (htop) Right up - Linux router (bwm-ng - showing pps) Right down - Linux router (lnstat) And all is good - performance 5Mpps until Linux router will reach ~1kk entries What You can see on next attached image: http://imageshack.us/photo/my-images/24/test2id.png/ Forwarding performance drops from 5Mpps to 1,8Mpps And after 3 - 4 minutes it will stop on 0,7Mpps After flushing the route cache performance increase from 0.7Mpps to 6Mpps What You can see on next attached image: http://imageshack.us/photo/my-images/197/test3r.png/ Is it possible to turn off route cache ? and see what performance will be without caching Thanks Pawel -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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