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From: Christoph Hellwig <hch@lst.de>
To: viro@zeniv.linux.org.uk
Cc: Avi Kivity <avi@scylladb.com>,
	linux-aio@kvack.org, linux-fsdevel@vger.kernel.org,
	netdev@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: aio poll, io_pgetevents and a new in-kernel poll API
Date: Tue, 9 Jan 2018 13:28:50 +0100	[thread overview]
Message-ID: <20180109122850.GA6567@lst.de> (raw)
In-Reply-To: <20180104080043.14506-1-hch@lst.de>

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.

WARNING: multiple messages have this Message-ID (diff)
From: Christoph Hellwig <hch@lst.de>
To: viro@zeniv.linux.org.uk
Cc: Avi Kivity <avi@scylladb.com>,
	linux-aio@kvack.org, linux-fsdevel@vger.kernel.org,
	netdev@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: aio poll, io_pgetevents and a new in-kernel poll API
Date: Tue, 9 Jan 2018 13:28:50 +0100	[thread overview]
Message-ID: <20180109122850.GA6567@lst.de> (raw)
In-Reply-To: <20180104080043.14506-1-hch@lst.de>

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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  parent reply	other threads:[~2018-01-09 12:28 UTC|newest]

Thread overview: 101+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-01-04  8:00 aio poll, io_pgetevents and a new in-kernel poll API Christoph Hellwig
2018-01-04  8:00 ` Christoph Hellwig
2018-01-04  8:00 ` [PATCH 01/31] fs: update documentation for __poll_t Christoph Hellwig
2018-01-04  8:00   ` Christoph Hellwig
2018-01-04  8:00 ` [PATCH 02/31] fs: add new vfs_poll and file_can_poll helpers Christoph Hellwig
2018-01-04  8:00   ` Christoph Hellwig
2018-01-06 19:08   ` Al Viro
2018-01-06 19:08     ` Al Viro
2018-01-08 10:44     ` Christoph Hellwig
2018-01-08 10:44       ` Christoph Hellwig
2018-01-04  8:00 ` [PATCH 03/31] fs: introduce new ->get_poll_head and ->poll_mask methods Christoph Hellwig
2018-01-04  8:00   ` Christoph Hellwig
2018-01-06 19:12   ` Al Viro
2018-01-06 19:12     ` Al Viro
2018-01-08 10:45     ` Christoph Hellwig
2018-01-08 10:45       ` Christoph Hellwig
2018-01-10 16:31       ` Al Viro
2018-01-10 16:31         ` Al Viro
2018-01-10 17:42         ` Christoph Hellwig
2018-01-04  8:00 ` [PATCH 04/31] net: add support for ->poll_mask in proto_ops Christoph Hellwig
2018-01-04  8:00   ` Christoph Hellwig
2018-01-06 19:16   ` Al Viro
2018-01-06 19:16     ` Al Viro
2018-01-08 10:48     ` Christoph Hellwig
2018-01-08 10:48       ` Christoph Hellwig
2018-01-09 16:32     ` Christoph Hellwig
2018-01-09 16:41       ` Christoph Hellwig
2018-01-09 16:41         ` Christoph Hellwig
2018-01-04  8:00 ` [PATCH 05/31] net: remove sock_no_poll Christoph Hellwig
2018-01-04  8:00   ` Christoph Hellwig
2018-01-04  8:00 ` [PATCH 06/31] net/tcp: convert to ->poll_mask Christoph Hellwig
2018-01-04  8:00 ` [PATCH 07/31] net/unix: " Christoph Hellwig
2018-01-04  8:00   ` Christoph Hellwig
2018-01-04  8:00 ` [PATCH 08/31] net: convert datagram_poll users tp ->poll_mask Christoph Hellwig
2018-01-04  8:00   ` Christoph Hellwig
2018-01-04  8:00 ` [PATCH 09/31] net/dccp: convert to ->poll_mask Christoph Hellwig
2018-01-04  8:00   ` Christoph Hellwig
2018-01-04  8:00 ` [PATCH 10/31] net/atm: " Christoph Hellwig
2018-01-04  8:00   ` Christoph Hellwig
2018-01-04  8:00 ` [PATCH 11/31] net/vmw_vsock: " Christoph Hellwig
2018-01-04  8:00   ` Christoph Hellwig
2018-01-04  8:00 ` [PATCH 12/31] net/tipc: " Christoph Hellwig
2018-01-04  8:00   ` Christoph Hellwig
2018-01-04  8:00 ` [PATCH 13/31] net/sctp: " Christoph Hellwig
2018-01-04  8:00   ` Christoph Hellwig
2018-01-04  8:00 ` [PATCH 14/31] net/bluetooth: " Christoph Hellwig
2018-01-04  8:00   ` Christoph Hellwig
2018-01-04  8:00 ` [PATCH 15/31] net/caif: " Christoph Hellwig
2018-01-04  8:00   ` Christoph Hellwig
2018-01-04  8:00 ` [PATCH 16/31] net/nfc: " Christoph Hellwig
2018-01-04  8:00   ` Christoph Hellwig
2018-01-04  8:00 ` [PATCH 17/31] net/phonet: " Christoph Hellwig
2018-01-04  8:00   ` Christoph Hellwig
2018-01-04  8:00 ` [PATCH 18/31] net/iucv: " Christoph Hellwig
2018-01-04  8:00 ` [PATCH 19/31] net/rxrpc: " Christoph Hellwig
2018-01-04  8:00   ` Christoph Hellwig
2018-01-04  8:00 ` [PATCH 20/31] pipe: " Christoph Hellwig
2018-01-04  8:00   ` Christoph Hellwig
2018-01-04  8:00 ` [PATCH 21/31] eventfd: switch " Christoph Hellwig
2018-01-04  8:00   ` Christoph Hellwig
2018-01-04  8:00 ` [PATCH 22/31] timerfd: convert " Christoph Hellwig
2018-01-04  8:00   ` Christoph Hellwig
2018-01-04  8:00 ` [PATCH 23/31] aio: don't print the page size at boot time Christoph Hellwig
2018-01-04  8:00   ` Christoph Hellwig
2018-01-09 17:18   ` Jeff Moyer
2018-01-09 17:18     ` Jeff Moyer
2018-01-04  8:00 ` [PATCH 24/31] aio: remove an outdated comment in aio_complete Christoph Hellwig
2018-01-04  8:00   ` Christoph Hellwig
2018-01-09 17:19   ` Jeff Moyer
2018-01-09 17:19     ` Jeff Moyer
2018-01-04  8:00 ` [PATCH 25/31] aio: refactor read/write iocb setup Christoph Hellwig
2018-01-04  8:00   ` Christoph Hellwig
2018-01-04  8:00 ` [PATCH 26/31] aio: sanitize ki_list handling Christoph Hellwig
2018-01-04  8:00   ` Christoph Hellwig
2018-01-04  8:00 ` [PATCH 27/31] aio: simplify cancellation Christoph Hellwig
2018-01-04  8:00   ` Christoph Hellwig
2018-01-04  8:00 ` [PATCH 28/31] aio: delete iocbs from the active_reqs list in kiocb_cancel Christoph Hellwig
2018-01-04  8:00   ` Christoph Hellwig
2018-01-04  8:00 ` [PATCH 29/31] aio: add delayed cancel support Christoph Hellwig
2018-01-04  8:00   ` Christoph Hellwig
2018-01-04  8:00 ` [PATCH 30/31] aio: implement IOCB_CMD_POLL Christoph Hellwig
2018-01-04  8:00   ` Christoph Hellwig
2018-01-04  8:00 ` [PATCH 31/31] aio: implement io_pgetevents Christoph Hellwig
2018-01-04  8:00   ` Christoph Hellwig
2018-01-09 22:16   ` Arnd Bergmann
2018-01-09 22:16     ` Arnd Bergmann
2018-01-10  8:11     ` Christoph Hellwig
2018-01-10 11:03       ` Arnd Bergmann
2018-01-10 14:59         ` Christoph Hellwig
2018-01-10 14:59           ` Christoph Hellwig
2018-01-10 15:48           ` Arnd Bergmann
2018-01-10 15:48             ` Arnd Bergmann
2018-01-10 15:49             ` Christoph Hellwig
2018-01-10 15:49               ` Christoph Hellwig
2018-01-10 15:56               ` Christoph Hellwig
2018-01-10 15:56                 ` Christoph Hellwig
2018-01-04  9:09 ` aio poll, io_pgetevents and a new in-kernel poll API Christoph Hellwig
2018-01-04  9:09   ` Christoph Hellwig
     [not found] ` <846305254.12.1515072390525.JavaMail.root@thunderbeast.private.linuxbox.com>
2018-01-04 13:28   ` Fwd: " Matt Benjamin
2018-01-09 12:28 ` Christoph Hellwig [this message]
2018-01-09 12:28   ` Christoph Hellwig

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