From: Yuanhan Liu <yuanhan.liu@linux.intel.com>
To: Rich Lane <rich.lane@bigswitch.com>
Cc: dev@dpdk.org, Huawei Xie <huawei.xie@intel.com>,
Thomas Monjalon <thomas.monjalon@6wind.com>
Subject: Re: [dpdk-dev] [PATCH] vhost: add back support for concurrent enqueue
Date: Sun, 11 Sep 2016 20:18:07 +0800 [thread overview]
Message-ID: <20160911121807.GX23158@yliu-dev.sh.intel.com> (raw)
In-Reply-To: <1471291224-12755-1-git-send-email-rich.lane@bigswitch.com>
On Mon, Aug 15, 2016 at 01:00:24PM -0700, Rich Lane wrote:
> Concurrent enqueue is an important performance optimization when the number
> of cores used for switching is different than the number of vhost queues.
> I've observed a 20% performance improvement compared to a strategy that
> binds queues to cores.
>
> The atomic cmpset is only executed when the application calls
> rte_vhost_enqueue_burst_mp. Benchmarks show no performance impact
> when not using concurrent enqueue.
>
> Mergeable RX buffers aren't supported by concurrent enqueue to minimize
> code complexity.
>
> Partially reverts 39449e74 ("vhost: remove concurrent enqueue") and
> includes a fix from "vhost: avoid reordering of used->idx and last_used_idx
> updating".
>
> Signed-off-by: Rich Lane <rich.lane@bigswitch.com>
> ---
> lib/librte_vhost/rte_vhost_version.map | 6 +++
> lib/librte_vhost/rte_virtio_net.h | 19 +++++++++
> lib/librte_vhost/vhost-net.h | 2 +
> lib/librte_vhost/vhost_rxtx.c | 77 ++++++++++++++++++++++++++++++----
> lib/librte_vhost/virtio-net.c | 2 +
> 5 files changed, 97 insertions(+), 9 deletions(-)
>
> diff --git a/lib/librte_vhost/rte_vhost_version.map b/lib/librte_vhost/rte_vhost_version.map
> index 5ceaa8a..ca9d49e 100644
> --- a/lib/librte_vhost/rte_vhost_version.map
> +++ b/lib/librte_vhost/rte_vhost_version.map
> @@ -30,3 +30,9 @@ DPDK_16.07 {
> rte_vhost_get_queue_num;
>
> } DPDK_2.1;
> +
> +DPDK_16.11 {
> + global:
> +
> + rte_vhost_enqueue_burst_mp
> +} DPDK_16.07;
Hi,
FYI, my testrobot caught some errors when this patch is applied.
--yliu
---
x86_64-native-linuxapp-clang: config-all-yes-shared
===================================================
/usr/bin/ld:/root/dpdk/lib/librte_vhost/rte_vhost_version.map:38: syntax error in VERSION script
clang: error: linker command failed with exit code 1 (use -v to see invocation)
make[5]: *** [librte_vhost.so.3.1] Error 1
make[4]: *** [librte_vhost] Error 2
make[4]: *** Waiting for unfinished jobs....
make[3]: *** [lib] Error 2
make[2]: *** [all] Error 2
make[1]: *** [pre_install] Error 2
make: *** [install] Error 2
error: build failed
prev parent reply other threads:[~2016-09-11 12:17 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-08-15 20:00 Rich Lane
2016-08-16 2:37 ` Yuanhan Liu
2016-08-18 18:27 ` Rich Lane
2016-08-22 14:16 ` Yuanhan Liu
2016-08-23 22:42 ` Rich Lane
2017-03-09 13:46 ` Thomas Monjalon
2017-03-14 5:59 ` Yuanhan Liu
2016-09-11 12:18 ` Yuanhan Liu [this message]
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