From: Anthony Liguori <aliguori@us.ibm.com>
To: Alan <alan@lxorguk.ukuu.org.uk>
Cc: tgingold@free.fr, xen-devel@lists.xensource.com,
Mark Williamson <mark.williamson@cl.cam.ac.uk>
Subject: Re: Re: Improving hvm IO performance by using self IO emulator (YA io-emu?)
Date: Fri, 23 Feb 2007 12:56:00 -0600 [thread overview]
Message-ID: <45DF38C0.20500@us.ibm.com> (raw)
In-Reply-To: <20070223125744.3c523661@lxorguk.ukuu.org.uk>
Alan wrote:
>> But it isn't supported by older kernels and most versions of Windows. A
>>
>
> Linux 2.4.x AHCI drivers exist. Windows 95/98 are lacking them as is NT
> that much is true, but Win2K and later support AHCI. AHCI is also very
> nice from a virtualisation point of view as you get commands in queues
> and you can batch them up sensibly.
>
> For older windows there is the ADMA interface which is saner to emulate
> than SFF but not very sane.
>
>
>> This discussion is independent of Xen. It's equally applicable to KVM
>> and QEMU so please don't assume this has anything to do with Xen's merge
>> status.
>>
>
> Don't even get me started on qemu. The qemu "emulation" of ATAPI is a good
> reason to use anything else as an interface.
>
Feel free to submit patches.
Regards,
Anthony Liguori
> Alan
>
next prev parent reply other threads:[~2007-02-23 18:56 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-02-22 5:23 Improving hvm IO performance by using self IO emulator (YA io-emu?) Tristan Gingold
2007-02-22 7:59 ` Keir Fraser
2007-02-22 9:33 ` tgingold
2007-02-22 10:23 ` Keir Fraser
2007-02-22 10:34 ` Improving hvm IO performance by using self IO emulator(YA io-emu?) Guy Zana
2007-02-22 16:06 ` Improving hvm IO performance by using self IO emulator (YA io-emu?) Anthony Liguori
2007-02-22 20:58 ` tgingold
2007-02-22 21:23 ` Anthony Liguori
2007-02-22 21:41 ` Mark Williamson
2007-02-24 6:19 ` Tristan Gingold
2007-02-24 6:07 ` Tristan Gingold
2007-02-22 21:24 ` Mark Williamson
2007-02-22 21:33 ` Anthony Liguori
2007-02-23 0:15 ` Mark Williamson
2007-02-23 0:26 ` Alan
2007-02-23 0:12 ` Anthony Liguori
2007-02-23 12:57 ` Alan
2007-02-23 18:56 ` Anthony Liguori [this message]
2007-02-24 6:17 ` Tristan Gingold
2007-02-23 0:32 ` Alan
2007-02-24 6:12 ` Tristan Gingold
2007-02-27 12:14 ` Mark Williamson
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