From: Stephen Hemminger <stephen@networkplumber.org>
To: Jie Hai <haijie1@huawei.com>
Cc: dev@dpdk.org, thomas@monjalon.net, ferruh.yigit@amd.com,
"Morten Brørup" <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
Date: Mon, 25 Nov 2024 11:44:10 -0800 [thread overview]
Message-ID: <20241125114410.2e8fe285@hermes.local> (raw)
In-Reply-To: <20241122071336.18470-1-haijie1@huawei.com>
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?
prev parent reply other threads:[~2024-11-25 19:44 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-11-22 7:13 Jie Hai
2024-11-22 9:14 ` lihuisong (C)
2024-11-22 11:01 ` Konstantin Ananyev
2024-11-26 7:39 ` Jie Hai
2024-11-25 19:44 ` Stephen Hemminger [this message]
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20241125114410.2e8fe285@hermes.local \
--to=stephen@networkplumber.org \
--cc=dev@dpdk.org \
--cc=fengchengwen@huawei.com \
--cc=ferruh.yigit@amd.com \
--cc=haijie1@huawei.com \
--cc=huangdengdui@huawei.com \
--cc=lihuisong@huawei.com \
--cc=mb@smartsharesystems.com \
--cc=thomas@monjalon.net \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).