nanog mailing list archives
Re: Quick question.
From: "Alexei Roudnev" <alex () relcom net>
Date: Tue, 3 Aug 2004 22:59:11 -0700
Alexei is talking about something else.a duallie will keep the system up when a faulty process hogs 100% CPU, because the second one is still available. That also increases availability ratio.This is a resource problem, not an availibility problem. A spinning application is not going to take down the machine on any modern OS[2] and anyway can be dealt with with resource limits, SMP or not, presuming your OS supports resource limits.
In theory, yes. On pracrtice, 2 CPU improve behavior dramatically. 4 CPU makes system too complex (as you wrote beloow). New P-IV with multi threading may be a good selection - behave as 2 CPU system but is not so complicated as SMP.
The real problem with SMP is kernel complexity. Drivers that are rock
s/is/was/ (5 years ago). Now most kernels are SMP. I agree that SMP kernels are much more complicated, but we _already_ paid this price. In reality, applications are less reliable on 2 CPU systems (if they have some kinds of bugs, which make sense on SMP only), so I agree with you in some cases.
Current thread:
- RE: Quick question., (continued)
- RE: Quick question. Michel Py (Jul 31)
- Re: Quick question. Joshua Brady (Aug 01)
- Re: Quick question. Alexei Roudnev (Aug 03)
- Re: Quick question. Alexei Roudnev (Aug 03)
- Re: Quick question. Joshua Brady (Aug 01)
- RE: Quick question. Michel Py (Aug 01)
- Re: Quick question. Colm MacCarthaigh (Aug 01)
- Re: Quick question. Alexei Roudnev (Aug 03)
- RE: Quick question. Paul Jakma (Aug 01)
- Re: Quick question. John Underhill (Aug 01)
- Re: Quick question. Paul Jakma (Aug 01)
- Re: Quick question. Alexei Roudnev (Aug 03)
- Re: Quick question. Paul Jakma (Aug 03)
- Re: Quick question. Colm MacCarthaigh (Aug 01)
- RE: Quick question. Michel Py (Jul 31)
- Re: Quick question. Robert E. Seastrom (Aug 01)