netdev - Re: Drops in qdisc on ifb interface

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Date:	Thu, 28 May 2015 11:30:38 -0400 (EDT)
From:	"jsullivan@...nsourcedevel.com" <jsullivan@...nsourcedevel.com>
To:	Eric Dumazet <eric.dumazet@...il.com>
Cc:	netdev@...r.kernel.org
Subject: Re: Drops in qdisc on ifb interface


> On May 28, 2015 at 11:14 AM Eric Dumazet <eric.dumazet@...il.com> wrote:
>
>
> On Thu, 2015-05-28 at 10:38 -0400, jsullivan@...nsourcedevel.com wrote:
>
<snip>
> IFB has still a long way before being efficient.
>
> In the mean time, you could play with following patch, and
> setup /sys/class/net/eth0/gro_timeout to 20000
>
> This way, the GRO aggregation will work even at 1Gbps, and your IFB will
> get big GRO packets instead of single MSS segments.
>
> Both IFB but also IP/TCP stack will have less work to do,
> and receiver will send fewer ACK packets as well.
>
> diff --git a/drivers/net/ethernet/intel/igb/igb_main.c
> b/drivers/net/ethernet/intel/igb/igb_main.c
> index
> f287186192bb655ba2dc1a205fb251351d593e98..c37f6657c047d3eb9bd72b647572edd53b1881ac
> 100644
> --- a/drivers/net/ethernet/intel/igb/igb_main.c
> +++ b/drivers/net/ethernet/intel/igb/igb_main.c
> @@ -151,7 +151,7 @@ static void igb_setup_dca(struct igb_adapter *);
> #endif /* CONFIG_IGB_DCA */
<snip>

Interesting but this is destined to become a critical production system for a
high profile, internationally recognized product so I am hesitant to patch.  I
doubt I can convince my company to do it but is improving IFB the sort of
development effort that could be sponsored and then executed in a moderately
short period of time? Thanks - John
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