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Re: [PATCH v4 3/3] migration/multifd: Report to user when zerocopy not w
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From: |
Leonardo Bras Soares Passos |
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Subject: |
Re: [PATCH v4 3/3] migration/multifd: Report to user when zerocopy not working |
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Date: |
Tue, 12 Jul 2022 21:33:38 -0300 |
On Tue, Jul 12, 2022 at 7:42 PM Peter Xu <peterx@redhat.com> wrote:
>
> On Mon, Jul 11, 2022 at 06:11:13PM -0300, Leonardo Bras wrote:
> > Some errors, like the lack of Scatter-Gather support by the network
> > interface(NETIF_F_SG) may cause sendmsg(...,MSG_ZEROCOPY) to fail on using
> > zero-copy, which causes it to fall back to the default copying mechanism.
> >
> > After each full dirty-bitmap scan there should be a zero-copy flush
> > happening, which checks for errors each of the previous calls to
> > sendmsg(...,MSG_ZEROCOPY). If all of them failed to use zero-copy, then
> > increment dirty_sync_missed_zero_copy migration stat to let the user know
> > about it.
> >
> > Signed-off-by: Leonardo Bras <leobras@redhat.com>
> > Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
>
> Acked-by: Peter Xu <peterx@redhat.com>
Thanks Peter!
> --
> Peter Xu
>