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| author | Leonardo Bras | 2022-07-11 23:11:13 +0200 |
|---|---|---|
| committer | Dr. David Alan Gilbert | 2022-07-20 13:15:09 +0200 |
| commit | d59c40cc483729f2e67c80e58df769ad19976fe9 (patch) | |
| tree | 252bf54ccd0ff3a7f405dd8691a98dcbad79e595 /linux-headers/linux/virtio_config.h | |
| parent | Add dirty-sync-missed-zero-copy migration stat (diff) | |
| download | qemu-d59c40cc483729f2e67c80e58df769ad19976fe9.tar.gz qemu-d59c40cc483729f2e67c80e58df769ad19976fe9.tar.xz qemu-d59c40cc483729f2e67c80e58df769ad19976fe9.zip | |
migration/multifd: Report to user when zerocopy not working
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>
Message-Id: <20220711211112.18951-4-leobras@redhat.com>
Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
Diffstat (limited to 'linux-headers/linux/virtio_config.h')
0 files changed, 0 insertions, 0 deletions