netdev - Re: [RFC 0/2] Delayed binding of UDP sockets for Quic per-connection sockets

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Date:   Wed, 31 Oct 2018 22:17:24 -0700
From:   Eric Dumazet <eric.dumazet@...il.com>
To:     Christoph Paasch <cpaasch@...le.com>
Cc:     netdev@...r.kernel.org, Ian Swett <ianswett@...gle.com>,
        Leif Hedstrom <lhedstrom@...le.com>,
        Jana Iyengar <jri.ietf@...il.com>
Subject: Re: [RFC 0/2] Delayed binding of UDP sockets for Quic per-connection
 sockets



On 10/31/2018 10:08 PM, Eric Dumazet wrote:

> Our plan is to use EDT model for UDP packets, so that we can
> still use one (not connected) UDP socket per cpu/thread.
> 
> We added in linux-4.20 the EDT model for TCP, and I intend to add the remaining part for sch_fq for 4.21.
> 
> UDP can use an ancillary message (SCM_TXTIME) to attach to the skb (which can be a GSO btw) a tstamp,
> and pacing will happen just fine.
> 

List of EDT patches in reverse order if you want to take a look :

3f80e08f40cdb308589a49077c87632fa4508b21 tcp: add tcp_reset_xmit_timer() helper
4c16128b6271e70c8743178e90cccee147858503 net: loopback: clear skb->tstamp before netif_rx()
79861919b8896e14b8e5707242721f2312c57ae4 tcp: fix TCP_REPAIR xmit queue setup
825e1c523d5000f067a1614e4a66bb282a2d373c tcp: cdg: use tcp high resolution clock cache
864e5c090749448e879e86bec06ee396aa2c19c5 tcp: optimize tcp internal pacing
7baf33bdac37da65ddce3adf4daa8c7805802174 net_sched: sch_fq: no longer use skb_is_tcp_pure_ack()
a7a2563064e963bc5e3f39f533974f2730c0ff56 tcp: mitigate scheduling jitter in EDT pacing model
76a9ebe811fb3d0605cb084f1ae6be5610541865 net: extend sk_pacing_rate to unsigned long
5f6188a8003d080e3753b8f14f4a5a2325ae1ff6 tcp: do not change tcp_wstamp_ns in tcp_mstamp_refresh
fb420d5d91c1274d5966917725e71f27ed092a85 tcp/fq: move back to CLOCK_MONOTONIC
90caf67b01fabdd51b6cdeeb23b29bf73901df90 net_sched: sch_fq: remove dead code dealing with retransmits
c092dd5f4a7f4e4dbbcc8cf2e50b516bf07e432f tcp: switch tcp_internal_pacing() to tcp_wstamp_ns
ab408b6dc7449c0f791e9e5f8de72fa7428584f2 tcp: switch tcp and sch_fq to new earliest departure time model
fd2bca2aa7893586887b2370e90e85bd0abc805e tcp: switch internal pacing timer to CLOCK_TAI
d3edd06ea8ea9e03de6567fda80b8be57e21a537 tcp: provide earliest departure time in skb->tstamp
9799ccb0e984a5c1311b22a212e7ff96e8b736de tcp: add tcp_wstamp_ns socket field
142537e419234c396890a22806b8644dce21b132 net_sched: sch_fq: switch to CLOCK_TAI
2fd66ffba50716fc5ab481c48db643af3bda2276 tcp: introduce tcp_skb_timestamp_us() helper
72b0094f918294e6cb8cf5c3b4520d928fbb1a57 tcp: switch tcp_clock_ns() to CLOCK_TAI base