netdev - Re: [PATCH net v7] net/ipv6: Add anycast addresses to a global hashtable

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Message-Id: <20181102.235507.1090700871024663396.davem@davemloft.net>
Date:   Fri, 02 Nov 2018 23:55:07 -0700 (PDT)
From:   David Miller <davem@...emloft.net>
To:     0xeffeff@...il.com
Cc:     netdev@...r.kernel.org, kuznet@....inr.ac.ru,
        yoshfuji@...ux-ipv6.org
Subject: Re: [PATCH net v7] net/ipv6: Add anycast addresses to a global
 hashtable

From: Jeff Barnhill <0xeffeff@...il.com>
Date: Fri,  2 Nov 2018 20:23:57 +0000

> icmp6_send() function is expensive on systems with a large number of
> interfaces. Every time it’s called, it has to verify that the source
> address does not correspond to an existing anycast address by looping
> through every device and every anycast address on the device.  This can
> result in significant delays for a CPU when there are a large number of
> neighbors and ND timers are frequently timing out and calling
> neigh_invalidate().
> 
> Add anycast addresses to a global hashtable to allow quick searching for
> matching anycast addresses.  This is based on inet6_addr_lst in addrconf.c.
> 
> Signed-off-by: Jeff Barnhill <0xeffeff@...il.com>

Applied, thank you.