OpenVZ slow network speed

[rubylaser]

I can get great disk I/O in an OpenVZ container vs a KVM virtual machine, but the networking is MUCH slower. About 1MB/s for OpenVZ vs 9-10MB/s for the KVM virtual machine. Both are Debian Lenny machines with 1GB of RAM on the same Proxmox host. Any ideas?

 

[dietmar]

Ho do you test network speed?

 

[rubylaser]

I tested by creating some dummy files (15MB, 50MB, 100MB, 1GB) on another host on the network and scp'd the files to each VM. I also rsync'd about 3GB of smaller files and got similar throughput that way as well. Maybe there's a more accurate way to test this?

 

[bogomolov]

Try to test with dd and netcat (probably your scp got less CPU cycles in OpenVZ than KVM) like this:

::Destination
nc -l <dest_ip> <some_port> | dd of=<some_path>

::Origin
dd if=./dummy.raw | nc <dest_ip> <dest_port>

Or you can try change the cypher from scp (blowfish works good with big files) and compare them...

[]´s