netdev - Re: [PATCH v2 net-next] neigh: reduce arp latency

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Message-Id: <20110812.025708.1569052368114569085.davem@davemloft.net>
Date:	Fri, 12 Aug 2011 02:57:08 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	eric.dumazet@...il.com
Cc:	ja@....bg, netdev@...r.kernel.org
Subject: Re: [PATCH v2 net-next] neigh: reduce arp latency

From: Eric Dumazet <eric.dumazet@...il.com>
Date: Tue, 09 Aug 2011 20:15:58 +0200

> Le mardi 09 août 2011 à 20:06 +0300, Julian Anastasov a écrit :
> 
>> 	To be correct with old NUD_INCOMPLETE logic may be we can use 
>> max(neigh->parms->retrans_time, HZ/2) here instead of HZ?
>> 
> 
> Thanks Julian a lot for reviewing, here is v2 adressing this point.
> 
> [PATCH v2 net-next] neigh: reduce arp latency
> 
> Remove the artificial HZ latency on arp resolution.
> 
> Instead of firing a timer in one jiffy (up to 10 ms if HZ=100), lets
> send the ARP message immediately.
> 
> Before patch :
> 
> # arp -d 192.168.20.108 ; ping -c 3 192.168.20.108
> PING 192.168.20.108 (192.168.20.108) 56(84) bytes of data.
> 64 bytes from 192.168.20.108: icmp_seq=1 ttl=64 time=9.91 ms
> 64 bytes from 192.168.20.108: icmp_seq=2 ttl=64 time=0.065 ms
> 64 bytes from 192.168.20.108: icmp_seq=3 ttl=64 time=0.061 ms
> 
> After patch :
> 
> $ arp -d 192.168.20.108 ; ping -c 3 192.168.20.108
> PING 192.168.20.108 (192.168.20.108) 56(84) bytes of data.
> 64 bytes from 192.168.20.108: icmp_seq=1 ttl=64 time=0.152 ms
> 64 bytes from 192.168.20.108: icmp_seq=2 ttl=64 time=0.064 ms
> 64 bytes from 192.168.20.108: icmp_seq=3 ttl=64 time=0.074 ms
> 
> Signed-off-by: Eric Dumazet <eric.dumazet@...il.com>

Applied.
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