Changes between Version 16 and Version 17 of Gigabit_Networks_Linux


Ignore:
Timestamp:
05/10/11 10:48:54 (13 years ago)
Author:
JJK
Comment:

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  • Gigabit_Networks_Linux

    v16 v17  
    147147Again, all results were obtained using 'iperf'.
    148148
    149 ||         || speed ||
    150 ||"raw"    || 8.8 Gbps ||
    151 ||via tun  || 1.3 Gbps ||
     149||         || mtu || speed ||
     150||"raw"    || 1500 || 8.8 Gbps ||
     151||"raw", no cksum offloading || 1500 || 3.8 Gbps ||
     152||via tun  || 9000 || 1.3 Gbps ||
     153||via tun  || 24000 || 2.4 Gbps ||
     154||via tun  || 48000 || 3.6 Gbps ||
    152155
    153 This shows the limits of the kernel-space/user-space division that is present in Linux. The performance of OpenVPN over this network is not yet understood, as the raw openssl speed of the computers in this network is much lower than that of servers listed above. Unfortunately, it was not possible to use two AES-NI capable PCs on this network.
     156This shows the limits of the kernel-space/user-space division that is present in Linux. It also shows how important TCP offloading is: if the TCP checksums need to be calculated in kernel space the performance drops by 50%!
    154157
     158The performance of OpenVPN over this network is not yet understood, as the raw openssl speed of the computers in this network is much lower than that of servers listed above. Unfortunately, it was not possible to use two AES-NI capable PCs on this network.
     159