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From: Thomas Monjalon <thomas.monjalon@6wind.com>
To: Zhihong Wang <zhihong.wang@intel.com>
Cc: dev@dpdk.org
Subject: Re: [PATCH] eal: fix rte_memcpy perf in hsw/bdw
Date: Wed, 15 Jun 2016 16:21:08 +0200	[thread overview]
Message-ID: <9020918.HyCU59pmu8@xps13> (raw)
In-Reply-To: <1464139383-132732-1-git-send-email-zhihong.wang@intel.com>

2016-05-24 21:23, Zhihong Wang:
> This patch fixes rte_memcpy performance in Haswell and Broadwell for
> vhost when copy size larger than 256 bytes.
> 
> It is observed that for large copies like 1024/1518 ones, rte_memcpy
> suffers high ratio of store buffer full issue which causes pipeline
> to stall in scenarios like vhost enqueue. This can be alleviated by
> adjusting instruction layout. Note that this issue may not be visible
> in micro test.
> 
> How to reproduce?
> 
> PHY-VM-PHY using vhost/virtio or vhost/virtio loop back, with large
> packets like 1024/1518 bytes ones. Make sure packet generation rate
> is not the bottleneck if PHY-VM-PHY is used.
> 
> Signed-off-by: Zhihong Wang <zhihong.wang@intel.com>

Test report: http://dpdk.org/ml/archives/dev/2016-May/039716.html

Applied, thanks

      parent reply	other threads:[~2016-06-15 14:21 UTC|newest]

Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2016-05-25  1:23 [PATCH] eal: fix rte_memcpy perf in hsw/bdw Zhihong Wang
2016-05-26  5:19 ` Xu, Qian Q
2016-05-26  9:36   ` Wang, Zhihong
2016-06-15 14:21 ` Thomas Monjalon [this message]

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