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Re: [Qemu-ppc] [PATCH 4/4] tests/pxe-test: Add some extra tests

From: David Gibson
Subject: Re: [Qemu-ppc] [PATCH 4/4] tests/pxe-test: Add some extra tests
Date: Fri, 15 Dec 2017 23:59:34 +1100
User-agent: Mutt/1.9.1 (2017-09-22)

On Fri, Dec 15, 2017 at 11:51:18AM +0100, Thomas Huth wrote:
> On 15.12.2017 11:16, David Gibson wrote:
> > Previously virtio-net was only tested for ppc64 in "slow" mode.  That
> > doesn't make much sense since virtio-net is used much more often in
> > practice than the spapr-vlan device which was tested always.  So, move
> > virtio-net to always be tested on ppc64.
> Actually, I just moved virtio-net on ppc64 to the slow category a couple
> of months ago:
> https://git.qemu.org/?p=qemu.git;a=commitdiff;h=ab06ec43577177a442e8e5
> This has been done since some people complained that SLOF is incredibly
> slow in in TCG mode and thus there is the risk of hitting the timeout on
> slow systems if they are overloaded.

Hm.  If we're really concerned about the speed, I'm more inclined to
move spapr-vlan to slow than virtio-net.  virtio-net is now a much
more common case.

> Things will hopefully get a little bit better with the "Use
> tcg_gen_lookup_and_goto_ptr" patch that you've queued in your
> ppc-for-2.12 branch,

Just now merged, as it happens.

> but still, the test is very slow on ppc64, so I'd
> rather keep it in the "slow" category. (virtio-net is already tested in
> big endian mode on s390x anyway, so we at least got some endianess test
> coverage for that NIC already).

TBH, I see this as exercising the firmware netboot features more than
the device model.

> > We had no tests at all for the q35 machine, which doesn't seem wise given
> > it's increasing prominence.  Add a couple of tests for it, including
> > testing the newer e1000e adapter.
> That sounds like a good idea! I wonder whether we should also test some
> "old" machine versions (in "slow" mode only, of course), like "pc-0.12"
> for example, to make sure that there are no regressions with old
> machines?

Maybe.  Not really my department.
David Gibson                    | I'll have my music baroque, and my code
david AT gibson.dropbear.id.au  | minimalist, thank you.  NOT _the_ _other_
                                | _way_ _around_!

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