From: "Jan Beulich" <JBeulich@suse.com>
To: Tomasz Wroblewski <tomasz.wroblewski@gmail.com>
Cc: jinsong.liu@intel.com, xen-devel@lists.xenproject.org
Subject: Re: GPU passthrough performance regression in >4GB vms due to XSA-60 changes
Date: Thu, 15 May 2014 14:23:41 +0100 [thread overview]
Message-ID: <5374DBFD0200007800012AEE@mail.emea.novell.com> (raw)
In-Reply-To: <5374AEBD.7090403@gmail.com>
>>> On 15.05.14 at 14:10, <tomasz.wroblewski@gmail.com> wrote:
> Not really sure why it only affects 64bit vms but I've just noticed the
> pci BARs for the card are being relocated by hvmloader as per some logs:
>
> (XEN) HVM3: Relocating guest memory for lowmem MMIO space enabled
> (XEN) HVM3: Relocating 0xffff pages from 0e0001000 to 14dc00000 for
> lowmem MMIO hole
> (XEN) HVM3: Relocating 0x1 pages from 0e0000000 to 15dbff000 for lowmem
> MMIO hole
>
> So it might be also related to that.
Indeed it might - what are the (guest) MTRR types for those regions?
Jan
next prev parent reply other threads:[~2014-05-15 13:23 UTC|newest]
Thread overview: 31+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-05-15 9:11 GPU passthrough performance regression in >4GB vms due to XSA-60 changes Tomasz Wroblewski
2014-05-15 12:32 ` Jan Beulich
2014-05-15 12:10 ` Tomasz Wroblewski
2014-05-15 13:23 ` Jan Beulich [this message]
2014-05-15 13:39 ` Tomasz Wroblewski
2014-05-15 14:34 ` Tomasz Wroblewski
2014-05-15 14:56 ` Tomasz Wroblewski
2014-05-15 16:07 ` Jan Beulich
2014-05-15 15:39 ` Tomasz Wroblewski
2014-05-16 6:33 ` Jan Beulich
2014-05-16 11:18 ` Tomasz Wroblewski
2014-05-16 11:38 ` Jan Beulich
2014-05-16 14:36 ` Jan Beulich
2014-05-19 10:29 ` Tomasz Wroblewski
2014-05-19 10:38 ` Jan Beulich
2014-05-19 10:47 ` Tomasz Wroblewski
2014-05-19 11:07 ` Jan Beulich
2014-05-19 11:32 ` Tomasz Wroblewski
2014-05-19 12:06 ` Jan Beulich
2014-05-19 12:17 ` Tomasz Wroblewski
2014-05-19 12:44 ` Jan Beulich
2014-05-19 14:20 ` Tomasz Wroblewski
2014-05-19 15:24 ` Jan Beulich
2014-05-19 15:48 ` Tomasz Wroblewski
2014-05-19 17:36 ` Tim Deegan
2014-05-20 6:31 ` Jan Beulich
2014-05-19 10:42 ` Tomasz Wroblewski
2014-05-19 11:01 ` Jan Beulich
2014-05-19 11:09 ` Tomasz Wroblewski
2014-05-19 11:19 ` Jan Beulich
2014-05-15 16:01 ` Jan Beulich
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