From: Yuanhan Liu <yuanhan.liu@linux.intel.com>
To: "Michal Orsák" <xorsak01@stud.fit.vutbr.cz>
Cc: Thomas Monjalon <thomas.monjalon@6wind.com>,
Jan Viktorin <viktorin@rehivetech.com>,
dev@dpdk.org
Subject: Re: [dpdk-dev] [dpdk-stable] [PATCH 1/2] net/virtio: fix performance regression due to TSO enabling
Date: Mon, 16 Jan 2017 19:21:10 +0800 [thread overview]
Message-ID: <20170116112110.GD10293@yliu-dev.sh.intel.com> (raw)
In-Reply-To: <8e8178c6-caa2-1b6e-10a0-c83820868db5@stud.fit.vutbr.cz>
On Mon, Jan 16, 2017 at 12:14:04PM +0100, Michal Orsák wrote:
> On 16.1.2017 12:12, Yuanhan Liu wrote:
> >On Mon, Jan 16, 2017 at 12:05:04PM +0100, Michal Orsák wrote:
> >>On 16.1.2017 08:12, Yuanhan Liu wrote:
> >>>On Fri, Jan 13, 2017 at 02:13:09PM +0800, Yuanhan Liu wrote:
> >>>>But it's not the test methodology I'd expect. You are purely testing
> >>>>the instruction cycles. The drop on ARM is something more like "the
> >>>>if instruction takes more cycles than the simple assignment".
> >>>>
> >>>>This macro is used in the case that one process is heavily writing
> >>>>same value (0 here) again and again while another process is heavily
> >>>>read it also again and again. That means cache violation always
> >>>>happen. With this macro, however, this cache issue could be avoided,
> >>>>since no write happens.
> >>>>
> >>>>For such workload, I don't think it would behaviour worse on ARM.
> >>>No reply yet; I will treat it as no objections, and please shout out if any.
> >>>
> >>>Both applied to dpdk-next-virtio.
> >>>
> >>> --yliu
> >>Hello,
> >>
> >>
> >>currently I am running short of time. If you have any test prepared which i
> >>can just ran, please send me a link.
> >No link, but you could try:
> >
> >- a typical PVP test
> >
> >- a txonly test: running txonly fwd mode in guest PMD while running
> > rxonly in fwd mode.
> >
> >The second is a micro test, thus I saw way bigger boost.
> >
> >When are you available for the testing, btw?
> 25.1.2017+
Okay, I will hold on a while to apply them.
--yliu
next prev parent reply other threads:[~2017-01-16 11:18 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-01-11 4:27 [dpdk-dev] [PATCH 0/2] net/virtio: optimize virtio net header reset Yuanhan Liu
2017-01-11 4:27 ` [dpdk-dev] [PATCH 1/2] net/virtio: fix performance regression due to TSO enabling Yuanhan Liu
2017-01-11 7:59 ` Maxime Coquelin
2017-01-11 8:08 ` Yuanhan Liu
2017-01-11 8:22 ` Olivier MATZ
2017-01-11 14:51 ` [dpdk-dev] [dpdk-stable] " Thomas Monjalon
2017-01-12 2:30 ` Yuanhan Liu
2017-01-12 15:02 ` Jan Viktorin
2017-01-13 6:13 ` Yuanhan Liu
2017-01-16 7:12 ` Yuanhan Liu
[not found] ` <46569522-b2c3-2a33-9111-049b73c79760@stud.fit.vutbr.cz>
[not found] ` <20170116111256.GA11439@yliu-dev.sh.intel.com>
[not found] ` <8e8178c6-caa2-1b6e-10a0-c83820868db5@stud.fit.vutbr.cz>
2017-01-16 11:21 ` Yuanhan Liu [this message]
[not found] ` <a12848b4-76ef-29bc-f512-81bd8c1b9b76@stud.fit.vutbr.cz>
2017-01-30 13:30 ` Yuanhan Liu
2017-01-30 13:54 ` Maxime Coquelin
2017-01-30 14:10 ` Yuanhan Liu
2017-01-11 4:27 ` [dpdk-dev] [PATCH 2/2] net/virtio: optimize header reset on any layout Yuanhan Liu
2017-01-11 8:01 ` Maxime Coquelin
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