linux-kernel - Re: [PATCH v4 0/9] epoll: Introduce new syscalls, epoll_ctl_batch and epoll

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Date:	Fri, 13 Mar 2015 15:56:33 +0100
From:	Paolo Bonzini <pbonzini@...hat.com>
To:	Jason Baron <jbaron@...mai.com>, Fam Zheng <famz@...hat.com>
CC:	linux-kernel@...r.kernel.org, Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>, x86@...nel.org,
	Alexander Viro <viro@...iv.linux.org.uk>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Kees Cook <keescook@...omium.org>,
	Andy Lutomirski <luto@...capital.net>,
	David Herrmann <dh.herrmann@...il.com>,
	Alexei Starovoitov <ast@...mgrid.com>,
	Miklos Szeredi <mszeredi@...e.cz>,
	David Drysdale <drysdale@...gle.com>,
	Oleg Nesterov <oleg@...hat.com>,
	"David S. Miller" <davem@...emloft.net>,
	Vivek Goyal <vgoyal@...hat.com>,
	Mike Frysinger <vapier@...too.org>,
	"Theodore Ts'o" <tytso@....edu>,
	Heiko Carstens <heiko.carstens@...ibm.com>,
	Rasmus Villemoes <linux@...musvillemoes.dk>,
	Rashika Kheria <rashika.kheria@...il.com>,
	Hugh Dickins <hughd@...gle.com>,
	Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
	Peter Zijlstra <peterz@...radead.org>,
	linux-fsdevel@...r.kernel.org, linux-api@...r.kernel.org,
	Josh Triplett <josh@...htriplett.org>,
	"Michael Kerrisk (man-pages)" <mtk.manpages@...il.com>,
	Omar Sandoval <osandov@...ndov.com>,
	Jonathan Corbet <corbet@....net>, shane.seymour@...com,
	dan.j.rosenberg@...il.com
Subject: Re: [PATCH v4 0/9] epoll: Introduce new syscalls, epoll_ctl_batch
 and epoll_pwait1



On 13/03/2015 15:46, Jason Baron wrote:
> > The throttling algorithm computes a duration for the next IO, which is used to
> > arm a timer in order to delay the request a bit. As timers are always rounded
> > *UP* to the effective granularity, the timeout being 1ms in epoll_pwait is just
> > too coarse and will lead to severe inaccuracy. With epoll_pwait1, we can avoid
> > the rounding-up.
> 
> right, but we could use the timerfd here to get the desired precision.

Fam, didn't you see slowdowns with few file descriptors
epoll_ctl+epoll_wait+timerfd compared to ppoll?

Do they disappear or improve with epoll_ctl_batch and epoll_pwait1?

Paolo
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