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From: "Zhang Haoyu" <zhanghy@sangfor.com>
To: Fam Zheng <famz@redhat.com>
Cc: Kevin Wolf <kwolf@redhat.com>,
	Peter Maydell <peter.maydell@linaro.org>,
	"Michael S. Tsirkin" <mst@redhat.com>,
	Stefan Hajnoczi <stefanha@gmail.com>,
	Ming Lei <ming.lei@canonical.com>,
	qemu-devel <qemu-devel@nongnu.org>,
	Stefan Hajnoczi <stefanha@redhat.com>,
	Paolo Bonzini <pbonzini@redhat.com>
Subject: Re: [Qemu-devel] [PATCH v6 0/3] linux-aio: introduce submit I/O asabatch
Date: Tue, 26 Aug 2014 16:38:31 +0800	[thread overview]
Message-ID: <201408261638292632707@sangfor.com> (raw)
In-Reply-To: 20140826074550.GD2517@T430.nay.redhat.com

>> Can we use the queued io data as caches, 
>> io write will directly return and tell the guest the io is completed after the io is enqueued, 
>> better user experience for burst io,
>> and io-read will firstly search the io queue, if matched data found, directly get the data from the queue, 
>> if not, then read the data from the disk or host page cache.
>> Any ideas?
>
>Guest kernel already has a page cache that exactly does this, also keeping a
>copy of guest request data in qemu may hurt the bandwidth in some cases.
>
You are right.
Does the io merging in queue is worthy to be performed ?

Thanks,
Zhang Haoyu
>Fam

  reply	other threads:[~2014-08-26  8:41 UTC|newest]

Thread overview: 9+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2014-07-04 10:04 [Qemu-devel] [PATCH v6 0/3] linux-aio: introduce submit I/O as a batch Ming Lei
2014-07-04 10:04 ` [Qemu-devel] [PATCH v6 1/3] block: block: introduce APIs for submitting IO " Ming Lei
2014-07-04 10:04 ` [Qemu-devel] [PATCH v6 2/3] linux-aio: implement io plug, unplug and flush io queue Ming Lei
2014-07-04 10:04 ` [Qemu-devel] [PATCH v6 3/3] dataplane: submit I/O as a batch Ming Lei
2014-07-07  8:36 ` [Qemu-devel] [PATCH v6 0/3] linux-aio: introduce " Stefan Hajnoczi
2014-08-26  7:31 ` [Qemu-devel] [PATCH v6 0/3] linux-aio: introduce submit I/O asa batch Zhang Haoyu
2014-08-26  7:45   ` Fam Zheng
2014-08-26  8:38     ` Zhang Haoyu [this message]
2014-08-26  7:53   ` [Qemu-devel] [PATCH v6 0/3] linux-aio: introduce submit I/O as a batch Zhang Haoyu

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