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From: Paolo Bonzini <pbonzini@redhat.com>
To: Stefan Hajnoczi <stefanha@gmail.com>
Cc: qemu-devel@nongnu.org, kwolf@redhat.com, famz@redhat.com,
	qemu-block@nongnu.org, stefanha@redhat.com
Subject: Re: [Qemu-devel] [Qemu-block] [PATCH v4 8/8] linux-aio: share one LinuxAioState within an AioContext
Date: Mon, 9 May 2016 18:31:44 +0200	[thread overview]
Message-ID: <5730BB70.8010600@redhat.com> (raw)
In-Reply-To: <20160419090953.GA16312@stefanha-x1.localdomain>



On 19/04/2016 11:09, Stefan Hajnoczi wrote:
>> > This has better performance because it executes fewer system calls
>> > and does not use a bottom half per disk.
> Each aio_context_t is initialized for 128 in-flight requests in
> laio_init().
> 
> Will it be possible to hit the limit now that all drives share the same
> aio_context_t?

It was also possible before, because the virtqueue can be bigger than
128 items; that's why there is logic to submit I/O requests after an
io_get_events.  As usual when the answer seems trivial, am I
misunderstanding your question?

Thanks,

Paolo

  reply	other threads:[~2016-05-09 16:31 UTC|newest]

Thread overview: 19+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2016-04-07 16:33 [Qemu-devel] [PATCH v4 0/8] bdrv_flush_io_queue removal, shared LinuxAioState Paolo Bonzini
2016-04-07 16:33 ` [Qemu-devel] [PATCH v4 1/8] block: Don't disable I/O throttling on sync requests Paolo Bonzini
2016-04-07 16:33 ` [Qemu-devel] [PATCH v4 2/8] block: make bdrv_start_throttled_reqs return void Paolo Bonzini
2016-04-07 16:33 ` [Qemu-devel] [PATCH v4 3/8] block: move restarting of throttled reqs to block/throttle-groups.c Paolo Bonzini
2016-04-07 16:33 ` [Qemu-devel] [PATCH v4 4/8] block: extract bdrv_drain_poll/bdrv_co_yield_to_drain from bdrv_drain/bdrv_co_drain Paolo Bonzini
2016-04-07 16:33 ` [Qemu-devel] [PATCH v4 5/8] block: introduce bdrv_no_throttling_begin/end Paolo Bonzini
2016-04-07 16:33 ` [Qemu-devel] [PATCH v4 6/8] block: plug whole tree at once, introduce bdrv_io_unplugged_begin/end Paolo Bonzini
2016-04-07 16:33 ` [Qemu-devel] [PATCH v4 7/8] linux-aio: make it more type safe Paolo Bonzini
2016-04-07 16:33 ` [Qemu-devel] [PATCH v4 8/8] linux-aio: share one LinuxAioState within an AioContext Paolo Bonzini
2016-04-19  9:09   ` [Qemu-devel] [Qemu-block] " Stefan Hajnoczi
2016-05-09 16:31     ` Paolo Bonzini [this message]
2016-05-10  9:30       ` Stefan Hajnoczi
2016-05-10  9:40         ` Kevin Wolf
2016-05-10 10:32           ` Paolo Bonzini
2016-05-11 13:22             ` Stefan Hajnoczi
2016-05-11 13:18           ` Stefan Hajnoczi
2016-05-11 13:23   ` [Qemu-devel] " Stefan Hajnoczi
2016-04-19  9:10 ` [Qemu-devel] [Qemu-block] [PATCH v4 0/8] bdrv_flush_io_queue removal, shared LinuxAioState Stefan Hajnoczi
2016-04-19 15:09   ` Kevin Wolf

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