Re: [PATCH v3 0/4] Use AF_ALG in checksum utilities

[Assaf Gordon]

Hello Paul,

On Mon, May 07, 2018 at 12:36:43AM -0700, Paul Eggert wrote:
> Assaf Gordon wrote:
[...] 
> > It won't matter to a single user on a desktop, but imagine
> > a shared server at a university, when all of a sudden a sysadmin
> > might see a very very high %SYS load - with almost no way to disagnose
> > what's going on.
> 
> Why won't sysadmins be able to diagnose this? Isn't %SYS time accounted for?

It is, and there are certainly tools to do so.

But I think (based on my somewhat limited experience) that it
is harder to diagnose casually. Most tools are geared towards
showning user-mode load.

I believe that a common rule-of-thumb is that long-term sustained
high %SYS load typically indicates a serious problem (veteran
sysadmins are welcomed to chime in and offer their opinion).

regards,
 - assaf