From: Anthony Liguori <anthony@codemonkey.ws>
To: Avi Kivity <avi@redhat.com>
Cc: Muli Ben-Yehuda <muli@il.ibm.com>,
agraf@suse.de, aliguori@us.ibm.com, kvm@vger.kernel.org,
jan.kiszka@siemens.com, Joerg Roedel <joro@8bytes.org>,
qemu-devel@nongnu.org, Luiz Capitulino <lcapitulino@redhat.com>,
agl@us.ibm.com, Nadav Amit <nadav.amit@gmail.com>,
Ben-Ami Yassour1 <benami@il.ibm.com>
Subject: Re: [Qemu-devel] Ideas wiki for GSoC 2010
Date: Mon, 15 Mar 2010 08:23:45 -0500 [thread overview]
Message-ID: <4B9E34E1.3090709@codemonkey.ws> (raw)
In-Reply-To: <4B9E320E.7040605@redhat.com>
On 03/15/2010 08:11 AM, Avi Kivity wrote:
> On 03/15/2010 03:03 PM, Joerg Roedel wrote:
>>
>>>> I will add another project - iommu emulation. Could be very useful
>>>> for doing device assignment to nested guests, which could make
>>>> testing a lot easier.
>>> Our experiments show that nested device assignment is pretty much
>>> required for I/O performance in nested scenarios.
>> Really? I did a small test with virtio-blk in a nested guest (disk read
>> with dd, so not a real benchmark) and got a reasonable read-performance
>> of around 25MB/s from the disk in the l2-guest.
>>
>
> Your guest wasn't doing a zillion VMREADs and VMWRITEs every exit.
>
> I plan to reduce VMREAD/VMWRITE overhead for kvm, but not much we can
> do for other guests.
VMREAD/VMWRITEs are generally optimized by hypervisors as they tend to
be costly. KVM is a bit unusual in terms of how many times the
instructions are executed per exit.
Regards,
Anthony Liguori
next prev parent reply other threads:[~2010-03-15 13:23 UTC|newest]
Thread overview: 46+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-03-10 21:30 [Qemu-devel] Ideas wiki for GSoC 2010 Luiz Capitulino
2010-03-11 7:55 ` [Qemu-devel] " Avi Kivity
2010-03-11 9:43 ` Paolo Bonzini
2010-03-11 11:25 ` Alexander Graf
2010-03-11 11:54 ` Avi Kivity
2010-03-11 11:56 ` Alexander Graf
2010-03-11 11:58 ` Avi Kivity
2010-03-11 12:03 ` Alexander Graf
2010-03-11 12:15 ` Avi Kivity
2010-03-12 10:49 ` [Qemu-devel] Re: [Android-virt] " Christoffer Dall
2010-03-12 12:32 ` Luiz Capitulino
2010-03-11 19:06 ` [Qemu-devel] " Cam Macdonell
2010-03-11 12:09 ` Paolo Bonzini
2010-03-11 13:19 ` Luiz Capitulino
2010-03-13 3:13 ` Edgar E. Iglesias
2010-03-11 13:16 ` Luiz Capitulino
2010-03-12 10:47 ` Jes Sorensen
2010-03-11 12:59 ` Luiz Capitulino
2010-03-11 13:00 ` Alexander Graf
2010-03-11 13:21 ` Luiz Capitulino
2010-03-11 22:59 ` Jamie Lokier
2010-03-12 9:48 ` Paolo Bonzini
2010-03-12 9:59 ` Gleb Natapov
2010-03-11 12:26 ` Avi Kivity
2010-03-11 13:09 ` [Qemu-devel] " Lucas Meneghel Rodrigues
2010-03-12 15:11 ` Adam Litke
2010-03-12 15:22 ` Luiz Capitulino
2010-03-12 15:38 ` Adam Litke
2010-03-12 15:56 ` Luiz Capitulino
2010-03-12 16:36 ` Anthony Liguori
2010-03-12 17:35 ` Luiz Capitulino
2010-03-15 12:25 ` Avi Kivity
2010-03-15 12:38 ` Joerg Roedel
2010-03-15 12:42 ` Avi Kivity
2010-03-15 13:14 ` Anthony Liguori
2010-03-15 15:59 ` Joerg Roedel
2010-03-15 12:53 ` Muli Ben-Yehuda
2010-03-15 13:03 ` Joerg Roedel
2010-03-15 13:11 ` Avi Kivity
2010-03-15 13:23 ` Anthony Liguori [this message]
2010-03-15 15:06 ` Avi Kivity
2010-03-16 1:21 ` Anthony Liguori
2010-03-16 5:50 ` Avi Kivity
2010-03-15 13:24 ` Joerg Roedel
2010-03-15 13:55 ` Anthony Liguori
2010-03-15 14:18 ` Muli Ben-Yehuda
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