netdev - Re: [net-next PATCH V2 1/9] net: frag evictor, avoid killing warm frag queues

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Message-ID: <1354230100.3299.40.camel@edumazet-glaptop>
Date:	Thu, 29 Nov 2012 15:01:40 -0800
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Jesper Dangaard Brouer <brouer@...hat.com>
Cc:	David Miller <davem@...emloft.net>, fw@...len.de,
	netdev@...r.kernel.org, pablo@...filter.org, tgraf@...g.ch,
	amwang@...hat.com, kaber@...sh.net, paulmck@...ux.vnet.ibm.com,
	herbert@...dor.hengli.com.au
Subject: Re: [net-next PATCH V2 1/9] net: frag evictor, avoid killing warm
 frag queues

On Thu, 2012-11-29 at 23:17 +0100, Jesper Dangaard Brouer wrote:

> For example lets give a threshold of 2000 MBytes:
> 
> [root@...gon ~]# sysctl -w net/ipv4/ipfrag_high_thresh=$(((1024**2*2000)))
> net.ipv4.ipfrag_high_thresh = 2097152000
> 
> [root@...gon ~]# sysctl -w net/ipv4/ipfrag_low_thresh=$(((1024**2*2000)-655350))
> net.ipv4.ipfrag_low_thresh = 2096496650
> 
> 4x10 Netperf adjusted output:
>  Socket  Message  Elapsed      Messages
>  Size    Size     Time         Okay Errors   Throughput
>  bytes   bytes    secs            #      #   10^6bits/sec
> 
>  229376   65507   20.00      298685      0    7826.35
>  212992           20.00          27              0.71
> 
>  229376   65507   20.00      366668      0    9607.71
>  212992           20.00          13              0.34
> 
>  229376   65507   20.00      254790      0    6676.20
>  212992           20.00          14              0.37
> 
>  229376   65507   20.00      309293      0    8104.33
>  212992           20.00          15              0.39
> 
> Can we agree that the current evictor strategy is broken?

Not really, you drop packets because of another limit.



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