Re: [PATCH v4 3/3] migration/multifd: Report to user when zerocopy not working

2022-07-12 Thread Leonardo Bras Soares Passos
On Tue, Jul 12, 2022 at 7:42 PM Peter Xu 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 t

Re: [PATCH v4 3/3] migration/multifd: Report to user when zerocopy not working

2022-07-12 Thread Peter Xu
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 ea

[PATCH v4 3/3] migration/multifd: Report to user when zerocopy not working

2022-07-11 Thread Leonardo Bras
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, wh