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