Question about X on the arm's.

Boszormenyi Zoltan zboszor at
Fri Nov 25 12:21:10 UTC 2016

2016-11-25 11:24 keltezéssel, Gene Heskett írta:
> On Monday 21 November 2016 17:41:45 Gene Heskett wrote:
>> Greetings X experts;
>> I bought a monitor that should have been able to do 1920x1080p60Hz.
>> One would expect thats a given when the card gets $140 lighter
>> carrying it out past the RF stuff in Wallies front door frame, so I
>> just bought 2 of the faster SBC's like the r-pi 3b but the one that
>> will display what the r-pi 3b puts out, claimed to be a bit faster.
>> It wasn't until I googled for its specs last night and discovered its
>> max is 1366x768 that I actually got a picture out of it hooked to
>> anything except the r-pi.
>> My question has to do with the rendering and screen refresh rate,
>> which is obviously about 1/4 of the speed an old single core, x86 P4.
>> I am assuming the X built for it is single threaded, and it could be
>> made more pleasant to use if it scattered its jobs about the 4 cores
>> in the typical arm cpu.
>> Is there a build switch that could accomplish this? This is a quad
>> core 64 bit arm cpu, running at its default clock of 1.5GHz which it
>> seems like should have the ponies to handle the load.  More heat sink
>> maybe.
> Ping?

Rasterman replied to you soon after your mail. See

>> Is there anything I can do, considering its only other job is
>> serviceing the keyboard and rodent?
> I've since found, using htop, that X is not the heaviest cpu hog, ssh is,
> about 3x that of X.
> What cipher is the least intensive cpu load? I've found these things do
> not have telnet services installed.

How about arcfour or one of its variants?
On a trusted the LAN even a slow Geode LX can produce more than
100Mbit LAN bandwith. With more CPU intensive ciphers the speed
is reduced to around 2MByte/sec.

> Comments and suggestions welcome.
>> Thanks everybody.
> Cheers, Gene Heskett

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