About performance tuning of jsnbd openbmc

[xiuzhi]

Hi Jeremy,
   Thank you very much for your  the suggestions to the VM  JS code.
   There was no improvement in nbd-client performance after I remove the logging JS code snippets. The speed keeps about 33KBytes/s to 36KBytes/s . 
 What configurations in the system  or nginx may affect the performance of nbd websocket In addition to web JS nbd server/client?
 Would you like to give me some debugging instructions?
Best,
Xiuzhi   
------------------ Original ------------------
From:  "jk";<jk at ozlabs.org>;
Send time: Thursday, May 30, 2019 4:43 PM
To: "xiuzhi"<1450335857 at qq.com>; 
Cc: "openbmc"<openbmc at lists.ozlabs.org>; 
Subject:  Re: About performance tuning of jsnbd openbmc



Hi Xiuzhi,

[CCing the openbmc list, as this is relevant]

> Hi Jeremy,
>    I am trying to  install Centos7.iso image by openbmc nbd-server.
> The performance is too slow to install the OS image . The speed is no
> more than 40KBytes/s. My network speed is 1000Mbps.
>   The speed is up to 512KBytes/s when the openbmc nbd-client connect
> to the  nbd-server of nbd3.19 which running on my ubuntu 16.04 PC.
>   What factors affect the transmission speed?
>  How can I improve the speed of nbdserver?
>   The attachments is patch to webui and phosphor-handler and
> nginx.conf(I user nginx as the webserver instead of the  bmcweb)


I see your client-side javascript includes this:

+                server.onlog = function(msg) {
+                    $scope.nbdslog += msg + "\n";
+                }

- I've found that the logging like that (appending to an increasingly-
large string) can cause fairly large slowdowns.

Could you try removing this and see if that improves the speed?

Cheers,


Jeremy
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