[CRIU] [Users] socket will take at least 0.5 seconds to recovery after docker restore done

[Yanbao Cui]

HI,

Sorry for give the relative timestamp.

Yeah, the gap cover my checkpoint/restore time. And larger than the whole
migration time.

It seems we can not find why the connection hang from the dump file

Pavel Emelyanov <xemul at parallels.com>于2015年7月30日周四 23:42写道：

> On 07/23/2015 03:33 PM, Yanbao Cui wrote:
> > Hi Pavel,
>
> Hi. Sorry for the late response. See my comments inline.
>
> > my test env and test results are as follows
> >
> > ENV:____
> >
> > tcp client on host: 192.168.9.170____
> >
> > tcp server in docker: 192.168.9.129____
> >
> > udp client in docker: 192.168.9.129____
> >
> > udp server on host: 192.168.9.170____
> >
> > __ __
> >
> > migrate docker container from host 192.168.9.170 to host
> 192.168.9.180____
> >
> > __ __
> >
> > Summarize:____
> >
> > migration time: checkpoint+restore = 0.569+1.709 = 2.278s____
> >
> > existing socket hang time: 3.6s, actually is 3.6-2.278 = *1.322s*,
> except migration downtime____
> >
> > __ __
> >
> > In tcpdump file timestamp is 3.941260 - 7.619094 for tcp, timestamp
> 4.012874 - 7.619208 for udp____
>
> I don't see such timestamps in the dump file.
>
> I see the only huge gap in tcpdump timestamps, here it is:
>
> 03:44:26.080341 IP 192.168.9.129.5925 > 192.168.9.170.38248: Flags [.],
> ack 81, win 227, options [nop,nop,TS val 578104050 ecr 578104050], length 0
> 03:44:26.151955 IP 192.168.9.129.46765 > 192.168.9.170.8557: UDP, length 19
> 03:44:29.758175 IP 192.168.9.129.5925 > 192.168.9.170.38248: Flags [.],
> ack 81, win 229, options [nop,nop,TS val 578104080 ecr 0], length 0
> 03:44:29.758239 IP 192.168.9.170.38248 > 192.168.9.129.5925: Flags [.],
> ack 3380, win 7378, options [nop,nop,TS val 578104970 ecr 578104050],
> length 0
>
> The packet sent at 03:44:29.758175 seem to be the window probe. After this
> the communication seem to happen OK
>
> 03:44:29.758954 IP 192.168.9.129.5925 > 192.168.9.170.38248: Flags [P.],
> seq 3380:4080, ack 81, win 229, options [nop,nop,TS val 578104330 ecr
> 578104970], length 700
> 03:44:29.759179 IP 192.168.9.170.38248 > 192.168.9.129.5925: Flags [P.],
> seq 81:91, ack 4080, win 7401, options [nop,nop,TS val 578104970 ecr
> 578104330], length 10
>
> Do the times 3:44:29... from tcpdump match your restore time?
>
> -- Pavel
>
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