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Date: Thu, 31 Mar 2016 19:55:25 -0700 From: Eric Dumazet <eric.dumazet@...il.com> To: Jason Wang <jasowang@...hat.com> Cc: davem@...emloft.net, mst@...hat.com, netdev@...r.kernel.org, linux-kernel@...r.kernel.org Subject: Re: [PATCH net-next 1/6] net: skbuff: don't use union for napi_id and sender_cpu On Fri, 2016-04-01 at 10:13 +0800, Jason Wang wrote: > > The problem is we want to support busy polling for tun. This needs > napi_id to be passed to tun socket by sk_mark_napi_id() during > tun_net_xmit(). But before reaching this, XPS will set sender_cpu will > make us can't see correct napi_id. > Looks like napi_id should have precedence then ? Only forwarding should allow the field to be cleared to allow XPS to do its job. Maybe skb_sender_cpu_clear() was removed too early (commit 64d4e3431e686dc37ce388ba531c4c4e866fb141) Look, it is 8pm here, I am pretty sure a solution can be found, but I am also need to take a break, I started at 3am today...
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