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Date: Tue, 30 Jun 2009 08:36:20 -0500
From: Anthony Liguori <anthony@codemonkey.ws>
MIME-Version: 1.0
Subject: Re: [Qemu-devel] [PATCH] Allow adjustment of http block device's
	readahead size.
References: <1246068684.4465.76.camel@voxel> <4A48C574.10205@codemonkey.ws>
	<1EC214E3-2B9D-4202-ADC4-05DDF691E927@suse.de>
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To: Alexander Graf <agraf@suse.de>
Cc: Nolan <nolan@sigbus.net>, "qemu-devel@nongnu.org" <qemu-devel@nongnu.org>

Alexander Graf wrote:
>
> On 29.06.2009, at 15:45, Anthony Liguori wrote:
>
>> Nolan wrote:
>>> Allow adjustment of http block device's readahead size, via the
>>> environment variable "HTTP_READAHEAD_SIZE".
>>>
>>> Signed-off-by: Nolan Leake <nolan <at> sigbus.net>
>>>
>>
>> I'd rather a command line option than an environmental variable.
>
> Wouldn't it make sense to pass arbitrary options via -drive to backends?
>
> That way we could have -drive 
> file=http://sample.com/test.iso,http-readahead=1024.

Where it gets complex is that you probably want those options to be 
included as qcow2 backing_file too.  I've thought about this in the past 
and haven't been able to come to a great solution.

Regards,

Anthony Liguori

> Alex
>