What does 'sintr' mean (in Ganglia)?

Question

I have created the following view in Ganglia, showing cpu_user stats:

Can someone tell me what Sintr means? I was not able to find any information on Google or stackexchange websites.

Interestingly, I have two servers with identical hardware that I'm monitoring, but only one of them has the Sintr entry (which caught my eye).

Answer 1

Okay, I found an answer hidden in some Ganglia dev mailing list...

From this post:

I also added two specific metrics to Linux. cpu_intr and cpu_sintr count the number of cycles spent on hard/soft interrupts.

Still wondering why it's only shown for one server and not for the other, but that's another story.