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Date:      Fri, 14 Aug 2020 19:51:25 +0000
From:      bugzilla-noreply@freebsd.org
To:        net@FreeBSD.org
Subject:   [Bug 248652] netmap: pkt-gen TX huge pps difference between 11-STABLE and 12-STABLE/CURRENT on ix & ixl NIC
Message-ID:  <bug-248652-7501-T7UyDr1BCu@https.bugs.freebsd.org/bugzilla/>
In-Reply-To: <bug-248652-7501@https.bugs.freebsd.org/bugzilla/>
References:  <bug-248652-7501@https.bugs.freebsd.org/bugzilla/>

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D248652

--- Comment #4 from Sylvain Galliano <sg@efficientip.com> ---
You're right, interrupt rate limit pps on CURRENT + X520 NIC:

pkt-gen, no busy wait

11-stable:  27500 irq/s
CURRENT:    5500  irq/s

pkt-gen, with busy wait on CURRENT: +30000 irq/s

Regarding NIC irq tunable, the only one related to 'ix' looks good:

# sysctl hw.ix.max_interrupt_rate
hw.ix.max_interrupt_rate: 31250

--=20
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