On Mon, Jan 25, 2021 at 10:35 AM Edwin Peer <edwin.peer@xxxxxxxxxxxx> wrote: > > Several weeks back, Jason already answered this VF scaling question from you at discussion [1]. > > > > [1] https://lore.kernel.org/netdev/20201216023928.GG552508@xxxxxxxxxx/ Regarding these costs: > A lot of the trappings that PCI-SIG requires to be implemented in HW > for a VF, like PCI config space, MSI tables, BAR space, etc. is all > just dead weight when scaling up to 1000's of VFs. What do these amount to in practice? Presumably config space is backed by normal memory controlled by firmware. Do VF's need to expose ECAM? Also, don't MSI tables come out of the BAR budget? Is the required BAR space necessarily more than any other addressable unit that can be delegated to a SF? Whatever the costs, presumably they need to be weighed against the complexity costs of the alternative? Regards, Edwin Peer
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