Not sure what you're referring to. Your driver specifically? Or the entire
guest OS? In general, there is not known to be any significant performance
difference between the chipsets either way. Specific devices might perform
faster with ICH9 (e.g. xHCI with MSIs is faster than xHCI without) but the
difference isn't huge.
If it's your driver specifically then... well, why is it behaving so
differently? Only you can find out.
Most of the devices aren't "required" as far as VirtualBox is concerned, but
there's only so far you can get without disk or network.
FYI, in my VM, AHCI definitely isn't behind a bridge. It's at bus/dev/fn
0:1f:02.
- Michal
----- Original Message -----
From: apallapo...@gmail.com
To: vbox-dev@virtualbox.org
Sent: Thursday, December 31, 2015 2:52:49 AM GMT +01:00 Amsterdam / Berlin /
Bern / Rome / Stockholm / Vienna
Subject: [vbox-dev] ICH9 devices
Hello Experts,
My "custom" driver execution takes long with ICH9 as compared to PIIX3, ~4X
difference. Custom device is a pluggable device registered.
Apart from 2 "ich9pcibridge" devices I don't see any thing else "new" in ICH9.
With ICH9, AHCI is connected on other side of the bridge (on bus 2), while on
PIIX3, it is on the root port. Could this be the reason for slowness ?
I used same settings between the two chipsets, have disabled "audio" in both
instances since I don't need them. Is there a way to reduce overall traffic ?
I presume all current devices in ICH9 are required (?) but is there a way to
improve performance ? I am not much bothered about other devices, apart from
having functional chipset.
Thanks.
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