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Date: Mon, 25 Nov 2024 11:44:10 -0800
From: Stephen Hemminger <stephen@networkplumber.org>
To: Jie Hai <haijie1@huawei.com>
Cc: <dev@dpdk.org>, <thomas@monjalon.net>, <ferruh.yigit@amd.com>, Morten
=?UTF-8?B?QnLDuHJ1cA==?= <mb@smartsharesystems.com>, Chengwen Feng
<fengchengwen@huawei.com>, Huisong Li <lihuisong@huawei.com>,
<huangdengdui@huawei.com>
Subject: Re: [PATCH] examples/l3fwd: fix Tx performance deteriorate
Message-ID: <20241125114410.2e8fe285@hermes.local>
In-Reply-To: <20241122071336.18470-1-haijie1@huawei.com>
References: <20241122071336.18470-1-haijie1@huawei.com>
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Errors-To: dev-bounces@dpdk.org
On Fri, 22 Nov 2024 15:13:36 +0800
Jie Hai <haijie1@huawei.com> wrote:
> The application send packets only when the buffer is full, or the
> buffer is empty and the number of packets to be sent extends half
> of the buffer.
>
> The change of MAX_PKT_BURST increases TX buffer size, while the
> default size of local cache on each lcore is 256, which not greater
> than the limit of transmitting. That would make the mbuf not on the
> local cache be frequently used and the performance deteriorates.
>
> This problem can be solved by making the TX threshold smaller than
> the local cache size. For example, use the '--mbcache' parameter to
> make the local cache greater. This patch optimizes the default
> performance by lowering TX threshold.
>
> Fixes: d5c4897ecfb2 ("examples/l3fwd: add option to set Rx burst size")
>
> Signed-off-by: Jie Hai <haijie1@huawei.com>
Do the other variants of l3fwd have the same problem?