From: Bruce Richardson <bruce.richardson@intel.com>
To: Nelson Escobar <neescoba@cisco.com>
Cc: dev@dpdk.org, johndale@cisco.com
Subject: Re: [dpdk-dev] [PATCH v2] enic: scattered Rx
Date: Fri, 24 Jun 2016 11:42:59 +0100 [thread overview]
Message-ID: <20160624104258.GA13456@bricha3-MOBL3> (raw)
In-Reply-To: <1466104745-21528-1-git-send-email-neescoba@cisco.com>
On Thu, Jun 16, 2016 at 12:19:05PM -0700, Nelson Escobar wrote:
> For performance reasons, this patch uses 2 VIC RQs per RQ presented to
> DPDK.
>
> The VIC requires that each descriptor be marked as either a start of
> packet (SOP) descriptor or a non-SOP descriptor. A one RQ solution
> requires skipping descriptors when receiving small packets and results
> in bad performance when receiving many small packets.
>
> The 2 RQ solution makes use of the VIC feature that allows a receive
> on primary queue to 'spill over' into another queue if the receive is
> too large to fit in the buffer assigned to the descriptor on the
> primary queue. This means that there is no skipping of descriptors
> when receiving small packets and results in much better performance.
>
> Signed-off-by: Nelson Escobar <neescoba@cisco.com>
> Reviewed-by: John Daley <johndale@cisco.com>
> ---
>
Applied to dpdk-next-net/rel_16_07
/Bruce
prev parent reply other threads:[~2016-06-24 10:43 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-06-14 23:55 [dpdk-dev] [PATCH] " Nelson Escobar
2016-06-16 19:19 ` [dpdk-dev] [PATCH v2] " Nelson Escobar
2016-06-24 10:42 ` Bruce Richardson [this message]
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