Right, AHCI isn't behind bridge, I misread. I certainly need network and disk.
Devices I see in my ICH9, VGA-CustomPassThrough, VGA, E1000, VMMDev, ACPI, LPC, ich9pcibridge 1, ich9pcibridge 2, AHCI, USB-OHCI Can I disable LPC, 2 bridges ? I can't seem to find the commands in user manual though. I am thinking slowness can be because CPU has to execute more instructions coming from "other extra" devices in ICH9 but when I am fairly using same setup, drivers as I used on PIIX3 ... not sure why ICH9 would take longer which infact we expect it to be faster. Please comment. Thanks. On Fri, Jan 1, 2016 at 1:04 PM, Michal Necasek <michal.neca...@oracle.com> wrote: > > 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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