| From: | Chris Bitmead <chris(dot)bitmead(at)bigfoot(dot)com> |
|---|---|
| To: | pgsql-general(at)postgreSQL(dot)org |
| Subject: | Re: [GENERAL] advice on buying sun hardware to run postgres |
| Date: | 1999-05-04 00:02:02 |
| Message-ID: | 372E38FA.2324947B@bigfoot.com |
| Views: | Raw Message | Whole Thread | Download mbox | Resend email |
| Thread: | |
| Lists: | pgsql-general |
Bruce Momjian wrote:
> When you get above two processor, the SMP method used by Linux, FreeBSD,
> BSD/OS, etc do not work as well as a kernel-level SMP like Solaris.
"kernel-level"? All SMP is kernel level. Solaris does much better but
there is no fundamental architectural difference as far as I know.
> In the Linux/*BSD SMP, you can only run a kernel call on
> one processor at a time.
If that was true, why has Linus just spent 2 years making kernel locks
more fine grained? If you could only run one kernel call at once anyway
then they must have wasted their time eh?
> IDE does not allow multiple outstanding request, can not access multiple
> disks at the same time, and requires more CPU to do the transfer than
> SCSI. This last point is normally forgotten.
Surely IDE can handle multiple disks at the same time if they are on a
different controller.
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