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Date: Mon, 11 Apr 2022 16:36:42 -0700 From: Vinicius Costa Gomes <vinicius.gomes@...el.com> To: Vladimir Oltean <vladimir.oltean@....com> Cc: "netdev@...r.kernel.org" <netdev@...r.kernel.org>, "jhs@...atatu.com" <jhs@...atatu.com>, "xiyou.wangcong@...il.com" <xiyou.wangcong@...il.com>, "jiri@...nulli.us" <jiri@...nulli.us>, "kuba@...nel.org" <kuba@...nel.org>, Po Liu <po.liu@....com>, "intel-wired-lan@...ts.osuosl.org" <intel-wired-lan@...ts.osuosl.org>, "anthony.l.nguyen@...el.com" <anthony.l.nguyen@...el.com>, "mkubecek@...e.cz" <mkubecek@...e.cz> Subject: Re: [PATCH net-next v4 11/12] igc: Check incompatible configs for Frame Preemption Vladimir Oltean <vladimir.oltean@....com> writes: > On Fri, Jun 25, 2021 at 05:33:13PM -0700, Vinicius Costa Gomes wrote: >> Frame Preemption and LaunchTime cannot be enabled on the same queue. >> If that situation happens, emit an error to the user, and log the >> error. >> >> Signed-off-by: Vinicius Costa Gomes <vinicius.gomes@...el.com> >> --- > > This is a very interesting limitation, considering the fact that much of > the frame preemption validation that I did was in conjunction with > tc-etf and SO_TXTIME (send packets on 2 queues, one preemptible and one > express, and compare the TX timestamps of the express packets with their > scheduled TX times). The base-time offset between the ET and the PT > packets is varied in small increments in the order of 20 ns or so. > If this is not possible with hardware driven by igc, how do you know it > works properly? :) Good question. My tests were much less accurate than what you were doing, I was basically flooding the link with preemptable packets, and sending some number of express packets, and counting them using some debug counters on the receiving side. Cheers, -- Vinicius
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