netdev - Re: Scalability of interface creation and deletion

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Date:	Sat, 07 May 2011 19:50:52 +0100
From:	Alex Bligh <alex@...x.org.uk>
To:	Eric Dumazet <eric.dumazet@...il.com>
cc:	netdev@...r.kernel.org, Alex Bligh <alex@...x.org.uk>
Subject: Re: Scalability of interface creation and deletion



--On 7 May 2011 20:42:29 +0200 Eric Dumazet <eric.dumazet@...il.com> wrote:

> Here is my trace here for one device deletion on one 8 core machine
>
> [  800.447012] synchronize_rcu() in 15787 us
> [  800.455013] synchronize_rcu() in 7682 us
> [  800.464019] rcu_barrier() in 8487 us

Would you mind trying it with my script to do veth devices? kill udev and do
unshare -n first.

I've done this on 2 different lots of hardware now, with 3 kernels 18
months apart.

$ grep RCU .config
# RCU Subsystem
CONFIG_TREE_RCU=y
# CONFIG_PREEMPT_RCU is not set
# CONFIG_RCU_TRACE is not set
CONFIG_RCU_FANOUT=64
# CONFIG_RCU_FANOUT_EXACT is not set
CONFIG_RCU_FAST_NO_HZ=y
# CONFIG_TREE_RCU_TRACE is not set
# CONFIG_SPARSE_RCU_POINTER is not set
# CONFIG_RCU_TORTURE_TEST is not set
# CONFIG_RCU_CPU_STALL_DETECTOR is not set


-- 
Alex Bligh
--
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