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Message-ID: <5462ed72-5180-3e10-c5d9-37762207653f@cumulusnetworks.com>
Date: Thu, 19 Oct 2017 09:38:27 -0600
From: David Ahern <dsa@...ulusnetworks.com>
To: Paolo Abeni <pabeni@...hat.com>, netdev@...r.kernel.org
Cc: "David S. Miller" <davem@...emloft.net>,
Steven Rostedt <rostedt@...dmis.org>,
Ingo Molnar <mingo@...hat.com>
Subject: Re: [PATCH net-next] ipv6: let trace_fib6_table_lookup() dereference
the fib table
On 10/19/17 1:31 AM, Paolo Abeni wrote:
> The perf traces for ipv6 routing code show a relevant cost around
> trace_fib6_table_lookup(), even if no trace is enabled. This is
> due to the fib6_table de-referencing currently performed by the
> caller.
>
> Let's the tracing code pay this overhead, passing to the trace
> helper the table pointer. This gives small but measurable
> performance improvement under UDP flood.
>
> Signed-off-by: Paolo Abeni <pabeni@...hat.com>
> ---
> include/trace/events/fib6.h | 6 +++---
> net/ipv6/route.c | 12 ++++++------
> 2 files changed, 9 insertions(+), 9 deletions(-)
Makes sense.
Acked-by: David Ahern <dsa@...ulusnetworks.com>
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