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Re: [Qemu-devel] Flatview rendering scalability issue
From: |
Sergio Lopez |
Subject: |
Re: [Qemu-devel] Flatview rendering scalability issue |
Date: |
Mon, 11 Mar 2019 14:48:48 +0100 |
User-agent: |
mu4e 1.0; emacs 26.1 |
Paolo Bonzini writes:
> On 11/03/19 10:26, Sergio Lopez wrote:
>> I guess this is a consequence of having to reset/rebuild the Flatview
>> when altering the PCI BAR regions.
>>
>> Is this a known issue we're already working on?
>
> What version of QEMU is this?
This upstream as of 6cb4f6db4f4367f (Mar 07 2019).
> The initialization is O(n^2) because the guest initializes one device at
> a time, so you rebuild the FlatView first with 0 devices, then 1, then
> 2, etc. This is very hard to fix, if at all possible.
>
> However, each FlatView creation should be O(n) where n is the number of
> devices currently configured. Please check with "info mtree -f" that
> you only have a fixed number of FlatViews. Old versions had one per device.
I'm seeing 9 FVs with 1 PCI, and 119 with 100 PCIs.
Thanks,
Sergio.
- [Qemu-devel] Flatview rendering scalability issue, Sergio Lopez, 2019/03/11
- Re: [Qemu-devel] Flatview rendering scalability issue, Paolo Bonzini, 2019/03/11
- Re: [Qemu-devel] Flatview rendering scalability issue,
Sergio Lopez <=
- Re: [Qemu-devel] Flatview rendering scalability issue, Paolo Bonzini, 2019/03/11
- Re: [Qemu-devel] Flatview rendering scalability issue, Sergio Lopez, 2019/03/11
- Re: [Qemu-devel] Flatview rendering scalability issue, Peter Xu, 2019/03/11
- Re: [Qemu-devel] Flatview rendering scalability issue, Paolo Bonzini, 2019/03/12
- Re: [Qemu-devel] Flatview rendering scalability issue, Peter Xu, 2019/03/12
- Re: [Qemu-devel] Flatview rendering scalability issue, Paolo Bonzini, 2019/03/12
- Re: [Qemu-devel] Flatview rendering scalability issue, Peter Xu, 2019/03/12