From: Stephen Hemminger <stephen@networkplumber.org>
To: Long Li <longli@microsoft.com>
Cc: dev@dpdk.org, aman.deep.singh@intel.com
Subject: Re: [PATCH] app/testpmd: reduce txonly multi-flow src_port range
Date: Thu, 26 Feb 2026 13:35:07 -0800 [thread overview]
Message-ID: <20260226133507.52427384@phoenix.local> (raw)
In-Reply-To: <20260226191625.1049670-1-longli@microsoft.com>
On Thu, 26 Feb 2026 11:16:25 -0800
Long Li <longli@microsoft.com> wrote:
> Reduce the UDP source port OR-mask from 0xC0 to 0xF0, lowering
> unique high-byte values from 64 to 16 (16 unique ports per lcore).
>
> Modern SmartNICs rarely need more than 16 queues to saturate RX,
> and excessive unique ports can exhaust hardware flow caching,
> degrading performance.
>
> Unique source ports by lcore count:
> 1: 16, 2: 32, 4: 64, 8: 128, 16: 256
>
> Signed-off-by: Long Li <longli@microsoft.com>
> ---
Make sense to make this less spread out.
I wonder if this should be a parameter to allow for testing different
spreads?
next prev parent reply other threads:[~2026-02-26 21:35 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-02-26 19:16 [PATCH] app/testpmd: reduce txonly multi-flow src_port range Long Li
2026-02-26 21:35 ` Stephen Hemminger [this message]
2026-02-26 23:21 ` [RFC] app/testpmd: add configurable flow count for txonly multi-flow Stephen Hemminger
2026-02-26 23:51 ` [EXTERNAL] " Long Li
2026-02-27 22:43 ` [PATCH v2] " Stephen Hemminger
2026-03-02 20:00 ` Stephen Hemminger
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