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Date: Thu, 16 Oct 2008 00:05:43 +0200
From: "andrzej zaborowski" <balrogg@gmail.com>
Subject: Re: [Qemu-devel] [PATCH 4/5] uhci: rewrite UHCI emulator,
	fully async operation with multiple outstanding transactions
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References: <cover.1218685607.git.maxk@kernel.org>
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To: qemu-devel@nongnu.org
Cc: Juergen Lock <nox@jelal.kn-bremen.de>

2008/10/15 Max Krasnyansky <maxk@qualcomm.com>:
> Hi Juergen,
>
> Juergen Lock wrote:
>>
>> This is whats got committed as r5050, right?  It causes a large slowdown
>> with some linux guests, as posted here:
>>        http://lists.gnu.org/archive/html/qemu-devel/2008-09/msg01201.html
>> As mentioned the guest I tested was:
>>        sidux-2008-03-ourea-pre1-kde-lite-i386-200809142136.iso
>> It uses a Linux 2.6.26 kernel, a FreeBSD guest is not affected by the
>> slowness, could this be related to dynticks?
>>
>>  Oh and on one box transfers over the emulated usb nic even sometimes
>> stall, I have to ping the guest's ip for them to continue, and the ping
>> then loses packets too.
>
> Can you please clarify your setup. As I understood, from the thread you
> mentioned above, you're running Linux 2.6.26 guest on QEMU under FreeBSD
> host,correct ?

For the record on Linux host I observed the same issues.  Juergen
mentioned that in an earlier mail.  The transfer rate is about 60kB/s
reading from an emulated mass storage device using a raw image.  It
was before about 1MB/s according to Juergen.  I wasn't using dynticks.

Cheers