netdev - Re: [PATCHv2] ixgbe: Re-enable relaxed ordering as part of init/restart sequence for non-DCA config

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Date:	Fri, 16 Jan 2015 06:45:58 -0800
From:	Jeff Kirsher <jeffrey.t.kirsher@...el.com>
To:	Sowmini Varadhan <sowmini.varadhan@...cle.com>
Cc:	jesse.brandeburg@...el.com, bruce.w.allan@...el.com,
	carolyn.wyborny@...el.com, donald.c.skidmore@...el.com,
	gregory.v.rose@...el.com, matthew.vick@...el.com,
	john.ronciak@...el.com, mitch.a.williams@...el.com,
	linux.nics@...el.com, e1000-devel@...ts.sourceforge.net,
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	sparclinux@...r.kernel.org, emil.s.tantilov@...el.com
Subject: Re: [PATCHv2] ixgbe: Re-enable relaxed ordering as part of
 init/restart sequence for non-DCA config

On Wed, 2015-01-14 at 20:03 -0500, Sowmini Varadhan wrote:
> Relaxed ordering is disabled by default at driver initialization
> and re-enabled when DCA is used. The reason it is disabled  was
> due to an issue on some chipsets (see comments in
> ixgbe_update_tx_dca()).
> But when DCA is not used, RO needs to be re-enabled, else we have
> a serialization bottleneck on platforms like SPARC.
> 
> This patch eliminates the bottleneck for ixgbe when DCA is not
> configured.
> 
> Signed-off-by: Sowmini Varadhan <sowmini.varadhan@...cle.com>
> Cc: Emil Tantilov <emil.s.tantilov@...el.com>
> 
> ---
> v2: incoroporate comments from Emil Tantilov
> 
>  drivers/net/ethernet/intel/ixgbe/ixgbe_82598.c  |   23
> +++++++++++++++++++++++
>  drivers/net/ethernet/intel/ixgbe/ixgbe_common.c |   20
> ++++++++++++++++++++
>  drivers/net/ethernet/intel/ixgbe/ixgbe_common.h |    1 +
>  drivers/net/ethernet/intel/ixgbe/ixgbe_main.c   |   11 +++++++++++
>  drivers/net/ethernet/intel/ixgbe/ixgbe_type.h   |    1 +
>  drivers/net/ethernet/intel/ixgbe/ixgbe_x540.c   |    1 +
>  6 files changed, 57 insertions(+), 0 deletions(-)

Thanks Sowmini, I have added your patch to my queue.

I know that Emil and others are looking into whether we can do this for
all ixgbe silicon, so we may have a follow-on patch to the work you have
done already to enable this for all devices.

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