Re: [gentoo-user] SR-IOV for RAID/HBA's? anyone tried it?

[J. Roeleveld]

On Monday, July 3, 2017 8:30:08 AM CEST Taiidan@×××.com wrote:
> On 07/03/2017 12:24 AM, J. Roeleveld wrote:
> > On July 2, 2017 7:36:02 PM GMT+02:00, "Taiidan@×××.com" <Taiidan@×××.com>
wrote:
> >> On 07/02/2017 02:51 AM, J. Roeleveld wrote:
> >>> On July 1, 2017 11:23:06 PM GMT+02:00, "Taiidan@×××.com"

> >> VM with quality performance.
> >> It'll always be faster than an emulated disk.
> >
> > Never noticed any performance issues. Using Xen and raw disk format to the
> > VMs.
> http://semiaccurate.com/2009/09/30/lsi-virtualizes-storage-hardware/

I am missing how to accessed the disks here in both options.
The difference in performance is far more then I ever saw, even with older 
hardware.
With that difference, it seems their KVM configuration is rubbish.

> For me I have 3/4 the native copy speed, and the I/O for example
> extracting a zip is terrible.

I never noticed any real difference, even when the host managed the HBA.
How do you configure your VMs and which technology do you use?

> >>> Either the VM needs a fraction of a single disk. Or it needs multiple
> >>
> >> disks.
> >>
> >>> For the latter case, I prefer to pass an entire HBA.
> >>
> >> Which one do you have and does yours support FLR?
> >
> > Using a Supermicro card based on a LSI3008 chipset and dual expander
> > backplane. I can always add a second HBA of I need more bandwidth.
> >
> > What is FLR? Googling that gives me a lot of non IT related results.
>
> Function level reset, it is required to be able to assign devices to
> VM's without annoyance.

Passing to VM works flawlessly with this card. Didn't have any issues with 
setting it all up.

> The 3K series supports SR-IOV so you probably have it.
> Could you run # lspci -vv?

Results from the VM attached.
I don't see any mention of SR-IOV in there.

My network-card does have this, but unless I can have the card do the bonding 
and vlans, I see no use for it there either.

--
Joost