Re: Route cache performance under stress

[Robert Olsson <Robert.Olsson@xxxxxxxxxxx>]

First run...
 
Worst senario 1 dst/pkt w. 64 byte pkts. 2*10 Million packets injected.
eth0, eth2. Input rate 2*190 kpps clone_skb=1. Routing table of 123946 
routes. UP. NAPI gives fairmess between both DoS attackers. :-) But more 
testing to be done. 


   plain   w. DaveM patch
----------------------------------
      72        114 kpps throughput
30271883   12246290 hash misses (second last in my rt_cache_stat)


58% better... and it can be further improved. 



Iface   MTU Met  RX-OK RX-ERR RX-DRP RX-OVR  TX-OK TX-ERR TX-DRP TX-OVR Flags
eth0   1500   0 1964858 9793618 9793618 8035147     16      0      0      0 BRU
eth1   1500   0     19      0      0      0 1887577      0      0      0 BRU
eth2   1500   0 1964698 9793419 9793419 8035305      3      0      0      0 BRU
eth3   1500   0      1      0      0      0 1886904      0      0      0 BRU
/proc/net/rt_cache_stat
000004ba  00000e27 003be7ba 00000000 00000000 00000000 00000000 00000000  
00000001 00000001 00000000 003869c1 00360b4d 00025dcb 00025dca 01cde98b 
00000000 


With DaveM hash-list limit patch.

Input rate 2*190 kpps clone_skb=1
Iface   MTU Met  RX-OK RX-ERR RX-DRP RX-OVR  TX-OK TX-ERR TX-DRP TX-OVR Flags
eth0   1500   0 2990462 9680257 9680257 7009542     12      0      0      0 BRU
eth1   1500   0     12      0      0      0 2990467      0      0      0 BRU
eth2   1500   0 2990460 9673421 9673421 7009544      4      0      0      0 BRU
eth3   1500   0      1      0      0      0 2990459      0      0      0 BRU
/proc/net/rt_cache_stat
00000000  00000607 005b3cfb 00000000 00000000 00000000 00000000 00000000  
00000000 00000002 00000000 005b2cfa 005b2ced 00000008 00000000 00badd12 
00000003 


Cheers.
                                                        --ro