From: "Lu, Wenzhuo" <wenzhuo.lu@intel.com>
To: Mohammad El-Shabani <mohammad.elshabani@gmail.com>,
"dev@dpdk.org" <dev@dpdk.org>
Subject: Re: [dpdk-dev] librte_pmd_ixgbe implementation of ixgbe_dev_rx_queue_count
Date: Tue, 29 Mar 2016 02:22:11 +0000 [thread overview]
Message-ID: <6A0DE07E22DDAD4C9103DF62FEBC09090343FAB9@shsmsx102.ccr.corp.intel.com> (raw)
In-Reply-To: <CAF_W8bccw4YAXNEVFwdTfWoFW_ZdrspTNVdtynigtAQLa4zsDQ@mail.gmail.com>
Hi Mohammad,
> -----Original Message-----
> From: dev [mailto:dev-bounces@dpdk.org] On Behalf Of Mohammad El-Shabani
> Sent: Tuesday, March 29, 2016 9:45 AM
> To: dev@dpdk.org
> Subject: [dpdk-dev] librte_pmd_ixgbe implementation of
> ixgbe_dev_rx_queue_count
>
> Hi,
> Looking into why it hurts performance, I see that ixgbe_dev_rx_queue_count is
> implemented a scan of elements of rx descriptors, which is very expensive. I am
> wondering why its implemented the way it is. Could it not just read the head
> location from the driver?
Not sure about the history. But to my opinion it's a control plane ops not a data plane ops. Maybe the reason is the author doesn't care about the performance too much.
As you have a good idea, would you like to share it with us? Thanks in advance:)
>
> Thanks!
> Mohammad El-Shabani
next prev parent reply other threads:[~2016-03-29 2:22 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-03-29 1:45 Mohammad El-Shabani
2016-03-29 2:22 ` Lu, Wenzhuo [this message]
2016-03-29 9:31 ` Bruce Richardson
2016-03-29 16:54 ` Stephen Hemminger
2016-03-30 14:23 ` Bruce Richardson
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