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Re: [Qemu-devel] [Qemu-block] [PATCH v4 8/8] linux-aio: share one LinuxA

From: Paolo Bonzini
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
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:38.0) Gecko/20100101 Thunderbird/38.7.1

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?



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