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Date: Sat, 23 Mar 2019 21:54:03 -0400 (EDT) From: David Miller <davem@...emloft.net> To: pabeni@...hat.com Cc: netdev@...r.kernel.org, edumazet@...gle.com, john.fastabend@...il.com, ivecera@...hat.com Subject: Re: [PATCH net-next v3 0/2] net: dev: BYPASS for lockless qdisc From: Paolo Abeni <pabeni@...hat.com> Date: Fri, 22 Mar 2019 16:01:54 +0100 > This patch series is aimed at improving xmit performances of lockless qdisc > in the uncontended scenario. > > After the lockless refactor pfifo_fast can't leverage the BYPASS optimization. > Due to retpolines the overhead for the avoidables enqueue and dequeue operations > has increased and we see measurable regressions. > > The first patch introduces the BYPASS code path for lockless qdisc, and the > second one optimizes such path further. Overall this avoids up to 3 indirect > calls per xmit packet. Detailed performance figures are reported in the 2nd > patch. > > v2 -> v3: > - qdisc_is_empty() has a const argument (Eric) > > v1 -> v2: > - use really an 'empty' flag instead of 'not_empty', as > suggested by Eric Looks great, series applied, thanks Paolo.
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