From: David Christensen <drc@linux.vnet.ibm.com>
To: Tom Barbette <barbette@kth.se>, "dev@dpdk.org" <dev@dpdk.org>
Subject: Re: [dpdk-dev] Performance impact of "declaring" more CPU cores
Date: Fri, 25 Oct 2019 10:35:50 -0700 [thread overview]
Message-ID: <f061d171-b9d5-eabd-6868-0169a5f7eace@linux.vnet.ibm.com> (raw)
In-Reply-To: <f46a3505-a4cd-d4a3-7429-ea5b29ca4b28@kth.se>
> The only useful observation we made is that when we are in a "bad case",
> the LLC has more cache misses.
Have you looked closely at the CPU topology on your platform, can you
provide some examples here of what you're seeing? The hwloc package is
very useful in visualizing how your logical cores map to CPU cache.
There may be benefit is more strategically selecting the lcores you use
to reduce LLC cache mssies.
Dave
next prev parent reply other threads:[~2019-10-25 17:35 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-10-24 17:32 Tom Barbette
2019-10-25 17:35 ` David Christensen [this message]
2019-10-30 17:20 ` Tom Barbette
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