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Date: Thu, 18 Jan 2018 18:03:41 -0500 From: Sowmini Varadhan <sowmini.varadhan@...cle.com> To: Willem de Bruijn <willemdebruijn.kernel@...il.com> Cc: Eric Dumazet <eric.dumazet@...il.com>, Network Development <netdev@...r.kernel.org>, David Miller <davem@...emloft.net>, rds-devel@....oracle.com, santosh.shilimkar@...cle.com Subject: Re: [PATCH RFC net-next 1/6] sock: MSG_PEEK support for sk_error_queue On (01/18/18 17:54), Willem de Bruijn wrote: > > 2. If we have the option of passing completion-notification up as ancillary > > data on the pollin/recvmsg channel itself (instead of MSG_ERRQUEUE) > > This assumes a somewhat symmetric workload, where there are enough recv > calls to reap the notification associated with the send calls. Your comment about the assumption is true, but at least for the database use-cases, we have a request-response model, so the assumption works out.. I dont know if many other workloads that send large buffers have this pattern. > I would stay with MSG_ERRQUEUE processing. One option is to pass data > up to userspace in the data portion of the notification skb instead of > encoding it in ancillary data, like tcp_get_timestamping_opt_stats. that's similar to what I have, except that it does not have the MSG_PEEK part (you'd need to enforce that the data portion is upper-bounded, and that the application has the responsibility of sending down "enough" buffer with recvmsg). Note that any one of these choices are ok with me- I have no special attachments to any of them. --Sowmini
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