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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite for Android: free password hash cracker in your pocket

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

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.



--
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