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

Hey folks -- yeah, I know, it's a weird one.

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 = 0Â # 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!

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