[X2Go-Dev] NX3.5 speed degradation

[Moritz Struebe]

Did you make sure you have the same connection settings (Network, Image
compression, etc)

Cheers
Morty

On 2012-03-28 14:05, Eugene San wrote:
> Hi all,
>
> I want to discuss the subject.
>
> Story goes like this:
> About 6 months, while planning upgrade (Ununtu 11.04->11.10) I've
> noticed severe degradation in speed of NX sessions.
> At the time I've decided to wait until LTS release, while being sure
> issue is related to GUI changes in Ubuntu.
> Recently I've reviewed the situation with 12.04 and found that problem
> is still there and related to NX and not to GUI changes in Ubuntu.
> My guess is that surrounding changes in distribution cause NX agent to
> misbehave.
>
> Overall user experience became unusable even on LAN and localhost connections.
>
> Now to the details:
> 1. Screen redraw operations lags heavily even on local links.
>     Instant (sub 0.5sec) on U10.04, up to 5 seconds on U12.04.
> 2. Constant screen redraws consume much more traffic.
>     Sub 100kbps on U10.04.
>     10mbps+ on U12.04 (Creating session with WAN quality settings and
> reconnecting with LAN, lowers bandwidth to sub 1mbps but picture
> quality suffers)
> 3. NX4 on U12.04 is faster 3x (in average) than 3.5 on U10.04.
> 4. NX3.5 on U12.04 is slower 3x then NX3.5 on U10.04 (some tests are
> x1000 slower!)
> 5. Hybrid NX3.5<->NX4 is slow with NX3.5 as server and fast with NX4 as server.
>
> Some details:
>   * I've evaluated both 32 and 64 bit platforms.
>   * I've compared fresh Ubuntu 10.04 and 12.04.
>   * Both Nomachine NX binaries and X2GO binaries (ppa:x2go/ppa) were tested.
>   * For reference I've performed NX4 and hybrid NX3.5<->NX4 testing.
>   * Tested several usecases:
>     * Desktop with manual operation of terminal, webbrowser and random
> GUI application.
>     * Rootless UnixBench in graphics mode. (Note in 64bit test caches NX agent!)
>     * Desktop UnixBench in graphics mode. (Note in 64bit test caches NX agent!)
>     * Rootless Xterm with scrolling text (ls -R /)
>
> Please provide your feedbacks.
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> X2Go-Dev at lists.berlios.de
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-- 
Dipl.-Ing. Moritz 'Morty' Struebe (Wissenschaftlicher Mitarbeiter)
Lehrstuhl für Informatik 4 (Verteilte Systeme und Betriebssysteme)
Friedrich-Alexander-Universität Erlangen-Nürnberg
Martensstr. 1
91058 Erlangen

Tel   : +49 9131 85-25419
Fax   : +49 9131 85-28732
eMail : struebe at informatik.uni-erlangen.de
WWW   : http://www4.informatik.uni-erlangen.de/~morty




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