Re: [PATCH 0/5] Reinstate ability to use Qemu on pre-SSE4.1 x86 hosts

[Paolo Bonzini <pbonzini@redhat.com>]

On Wed, Jun 12, 2024 at 3:34 PM Alexander Monakov <amonakov@ispras.ru> wrote:
> On Wed, 12 Jun 2024, Paolo Bonzini wrote:
> > > I found out from the mailing list. My Core2-based desktop would be affected.
> >
> > Do you run QEMU on it? With KVM or TCG?
>
> Excuse me? Are you going to ask for SSH access to ensure my computer really
> exists and is in working order?

Come on. The thing is, I'm not debating the existence of computers
that don't have x86_64-v2, but I *am* debating the usefulness of
making QEMU run on them and any extra information can be interesting.

> Can you tell me why you never commented on buffer_is_zero improvements, where
> v1 was sent in October?  Just trying to understand how you care for 2% of L1D
> use but could be ok with those kinds of speedups be dropped on the floor.

I'm not sure if there is any overlap in the scenarios where
buffer_is_zero performance matters, and x86 emulation. People can care
about thing A but not thing B. If there's anything that you think I
can help reviewing, feel free to let me know offlist.

Paolo