Re: [coLinux-users] Network performance between coLinix instaces

[Blake <pb...@ta...>]

You should test further.  I tried to reproduce your results and found =
that initially things look this way.  But if I ssh into the colinux =
instance and try the tests, then the colinux' netperf network =
performance is actually better than loopback. =20

Even when I then switch back to using the default CoLinux console after =
this, the netperf network results are as they were in the ssh session. =20

So maybe you need at least 1 open TCP session to achieve acceptable =
performance on this test.  Try ssh-ing from one instance to the other =
and then run the test from that one to the first.  And then reverse this =
procedure.

I'm using the TAP bridging scheme in XP.  How are you setup?

--=20
--Blake
pb...@ta...

"Taisuke Yamada" <tya...@li...> wrote in message =
news:nqt...@ho......
> Hi.
>=20
> I've set up 2 coLinux instances with NFS client-server
> configuration to save diskspace, but performance is way
> slower than I expected.
>=20
> To quantify my experience, I dis some benchmarking with
> netperf. In following data, "co00" is the NFS server
> and "co01" is the client. They both use TAP driver bridged
> by Windows "Network Bridge" for network connection.
>=20
>   co00:/root# netperf
>   TCP STREAM TEST to localhost
>   Recv   Send    Send
>   Socket Socket  Message  Elapsed
>   Size   Size    Size     Time     Throughput
>   bytes  bytes   bytes    secs.    10^6bits/sec
>  =20
>    87380  16384  16384    10.00    8599.03
>   co00:/root#
>=20
>   co01:/root# netperf -H 192.168.100.100
>   TCP STREAM TEST to 192.168.100.100
>   Recv   Send    Send
>   Socket Socket  Message  Elapsed
>   Size   Size    Size     Time     Throughput
>   bytes  bytes   bytes    secs.    10^6bits/sec
>  =20
>    87380  16384  16384    10.02      23.39
>   co01:/root#
>=20
> As you can see, TCP thoughput between 2 colinux instances
> is about 400 times slower than loopback.
>=20
> Is this a current limitation, or am I doing something wrong?
> Since there's no physical device between these two, I'm
> wondering if there's any coLinux parameter to increase
> network performance.
>=20
> Thanks in advance.
>=20