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  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:	Wed, 23 Oct 2013 05:00:01 -0700
From:	Eric Dumazet <>
To:	Wolfgang Walter <>
Cc:	Steffen Klassert <>,
	David Miller <>,,,
Subject: Re: Big performance loss from 3.4.63 to 3.10.13 when routing ipv4

On Wed, 2013-10-23 at 13:33 +0200, Wolfgang Walter wrote:

> I don't know what this value actually means. But on 3.4.x it is much higher. 
> On a machine with 512MB ram it is 32768, on a machine with 1GB ram it is 
> 262144 and with 16GB ram it is 4194304.

Such huge values should not be needed. We should have at most one dst
per packet in flight.

On a loaded router, a NIC not using BQL could queue around 16,000

Of course, Qdisc layers could also store a lot of packets, but using the
default pfifo_fast is only adding 1000 packets per interface.

I guess using 65536 as the default value should be safe and reasonable

Have you tried using 32768 or 65536 ?

To unsubscribe from this list: send the line "unsubscribe netdev" in
the body of a message to
More majordomo info at

Powered by blists - more mailing lists