linux-kernel - Re: aio poll, io_pgetevents and a new in-kernel poll API

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Message-ID: <20180109122850.GA6567@lst.de>
Date:   Tue, 9 Jan 2018 13:28:50 +0100
From:   Christoph Hellwig <hch@....de>
To:     viro@...iv.linux.org.uk
Cc:     Avi Kivity <avi@...lladb.com>, linux-aio@...ck.org,
        linux-fsdevel@...r.kernel.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: aio poll, io_pgetevents and a new in-kernel poll API

On Thu, Jan 04, 2018 at 09:00:12AM +0100, Christoph Hellwig wrote:
> The changes were sponsored by Scylladb, and improve performance
> of the seastar framework up to 10%, while also removing the need
> for a privileged SCHED_FIFO epoll listener thread.

Due to the current events:

With KPTI enabled the aio poll code is almost 16% faster than epoll
with the special SCHED_FIFO listener thread.

The Scylladb https example is still more than 4% faster with KPTI
and aio poll vs non-KPTI with epoll.