From: neeraj.sj@satyaki.co.in
To: "Anantharam, Arjun" <arjun.anantharam@intel.com>
Cc: users@dpdk.org
Subject: Re: [ICE DPDK 21.11] Latency bump at certain rate
Date: Tue, 11 Jan 2022 04:40:02 +0000 [thread overview]
Message-ID: <625bb48cfbe2cd48b7afc79a41f24120@satyaki.co.in> (raw)
In-Reply-To: <MW3PR11MB4761E06FFB73CA9699DD1CE8804D9@MW3PR11MB4761.namprd11.prod.outlook.com>
On 2022-01-07 21:48, Anantharam, Arjun wrote:
> 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
Hi,
We are concerned about dropping the traffic, by limiting its rate to 22
to 24 gbps, rather than allowing complete 40gbps, a formula for cir,
pir, ebs and cbs would be more appreciated.
Thanks.
next prev parent reply other threads:[~2022-01-11 4:40 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-01-07 21:48 Anantharam, Arjun
2022-01-11 4:40 ` neeraj.sj [this message]
-- strict thread matches above, loose matches on Subject: below --
2021-12-21 12:47 Yueyang Pan
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