From: Paolo Bonzini <pbonzini@redhat.com>
To: "Michael Büsch" <m@bues.ch>
Cc: kvm@vger.kernel.org
Subject: Re: KVM with PCI forwarding really slow after 4.1
Date: Wed, 16 Dec 2015 19:11:52 +0100 [thread overview]
Message-ID: <5671A968.3090404@redhat.com> (raw)
In-Reply-To: <20151216185528.75edf799@wiggum>
On 16/12/2015 18:55, Michael Büsch wrote:
>>> On 01/12/2015 18:09, Michael Büsch wrote:
>>>>> I use "-device pci-assign,host=00:1a.0" to forward a USB
>>>>> host chip to a Win7 32 bit inside of qemu/kvm. That used to
>>>>> work pretty well, but it broke horribly somewhere after
>>>>> 4.1. With recent kernels the virtual machine boots, but is
>>>>> _very_ slow. It takes hours to boot. If PCI forwarding is
>>>>> disabled, everything is fine.
>>>
>>> This has been reported already, I'm going to look at it this
>>> week.
>
> Are there any news regarding this issue?
It's being discussed in Bugzilla
(https://bugzilla.kernel.org/show_bug.cgi?id=107561).
Paolo
prev parent reply other threads:[~2015-12-16 18:11 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-12-01 17:09 KVM with PCI forwarding really slow after 4.1 Michael Büsch
2015-12-01 17:47 ` Paolo Bonzini
2015-12-16 17:55 ` Michael Büsch
2015-12-16 18:11 ` Paolo Bonzini [this message]
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=5671A968.3090404@redhat.com \
--to=pbonzini@redhat.com \
--cc=kvm@vger.kernel.org \
--cc=m@bues.ch \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.