Re: [Xen-users] Choice between poor HAP performance or no audio? (VGA passthrough)

[Ian Campbell <ian.campbell@xxxxxxxxxx>]

On Wed, 2015-05-13 at 19:29 -0700, Scott Helvick wrote:
> Hey folks -- yeah, I know, it's a weird one.

I think it might be worth raising this one as a bug on the xen-devel
list[0]. In particular the poor performance with HAP seems like the sort
of thing which would garner attention from the devs who deal with such
things, so I'd start by focusing on that since that's the configuration
I think you actually want to be using.

Ian.

[0] http://wiki.xen.org/wiki/Reporting_Bugs_against_Xen

> 
> 
> I was initially investigating performance issues with VGA passthrough
> and 8GB of memory when I found this:
> http://lists.xenproject.org/archives/html/xen-users/2014-09/msg00117.html. As 
> per the recommendation, disabling HAP, did work, but that resulted in another 
> problem -- the video card's HDMI audio stopped working! The audio device 
> still shows up in the Win7 guest and otherwise appears to work, but no sound 
> actually comes out.
> 
> 
> So currently my options are:
> 
> 1) HAP, sound, low DomU RAM (1GB or so)
> 
> 2) Shadow paging, no sound, 8GB RAM
> 
> 3) HAP, sound, 8GB RAM, and a basically unusable guest :-(
> 
> 
> Xen is 4.4 with the xl toolstack. Video card is a Radeon R9 290X @ 4k;
> latest Catalyst drivers (15.4 beta). I wondered if the 4k was playing
> a part, but I did decrease the resolution to 1920x1080, to no effect.
> Also no luck switching between DP and HDMI cables.
> 
> 
> My (abbreviated) DomU config is as follows:
> 
> 
> maxmem = 8192
> 
> memory = 8192
> 
> vcpus = 8
> 
> builder = "hvm"
> 
> pae = 1
> 
> acpi = 1
> 
> apic = 1
> 
> hap = 0
> 
> oos = 0  # I discovered turning this off helps with video card
> stability when HAP is also off.
> 
> viridian = 1
> 
> usb = 1
> 
> usbdevice = "tablet"
> 
> pci = [ "0000:01:00.0", "0000:01:00.1", "0000:04:00.0" ]
> 
> disk = [ "phy:/dev/sda,xvda,w", "phy:/dev/sr0,xvdb:cdrom,r" ]
> 
> pci_power_mgmt = 1
> 
> gfx_passthru = 0
> 
> vga = "stdvga"
> 
> xen_platform_pci = 1
> 
> device_model_version = "qemu-xen-traditional"
> 
> shadow_memory = 256 # I've tried various values of this, up to 512.
> Doesn't seem to change much.
> 
> 
> Any assistance is appreciated!
> 
> 
> Thanks,
> 
> -Scott
> 
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> http://lists.xen.org/xen-users



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