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From: "Anantharam, Arjun" <arjun.anantharam@intel.com>
To: "users@dpdk.org" <users@dpdk.org>
Subject: Re: [ICE DPDK 21.11] Latency bump at certain rate
Date: Fri, 7 Jan 2022 21:48:49 +0000	[thread overview]
Message-ID: <MW3PR11MB4761E06FFB73CA9699DD1CE8804D9@MW3PR11MB4761.namprd11.prod.outlook.com> (raw)

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Hi,

I believe the suggestion here would be to try the new "rx_low_latency=1" option enabled with DPDK 21.11:

*        Low Rx latency (default 0)
vRAN workloads require low latency DPDK interface for the front haul interface connection to Radio. By specifying 1 for parameter rx_low_latency, each completed Rx descriptor can be written immediately to host memory and the Rx interrupt latency can be reduced to 2us:
-a 0000:88:00.0,rx_low_latency=1
As a trade-off, this configuration may cause the packet processing performance degradation due to the PCI bandwidth limitation.


If they are using an old DPDK version, they can try to backport below patch
http://patchwork.dpdk.org/project/dpdk/patch/20210924093429.12068-1-alvinx.zhang@intel.com/

Thanks

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             reply	other threads:[~2022-01-07 21:48 UTC|newest]

Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-01-07 21:48 Anantharam, Arjun [this message]
2022-01-11  4:40 ` neeraj.sj
  -- strict thread matches above, loose matches on Subject: below --
2021-12-21 12:47 Yueyang Pan

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