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Re: [Qemu-devel] Query for PCI burst support
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From: |
Stefan Hajnoczi |
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Subject: |
Re: [Qemu-devel] Query for PCI burst support |
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Date: |
Mon, 13 Feb 2017 14:18:41 +0000 |
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User-agent: |
Mutt/1.7.1 (2016-10-04) |
On Mon, Feb 06, 2017 at 11:28:24AM +0530, Gaurav Sharma wrote:
> Is it possible to generate a PCIe burst of greater than 2dw for any MMIO.
> I see we have limit of max 2dw operation for any MemoryRegion defined by
> the max access size.
My understanding is that QEMU does not emulate bursts because it's a
functional simulator rather than low-level PCI bus transaction
simulator.
You might be interested in KVM's coalesced MMIO feature. That is a
performance optimization but it's not PCI-specific.
Why are you trying to do PCIe bursts?
Stefan
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