Re: zfs + uma

2010-09-22 Thread Andriy Gapon
on 21/09/2010 19:16 Alan Cox said the following: Actually, I think that there is a middle ground between per-cpu caches and directly from the VM that we are missing. When I've looked at the default configuration of ZFS (without the extra UMA zones enabled), there is an incredible amount of

Bumping MAXCPU on amd64?

2010-09-22 Thread Maxim Sobolev
Hi, Is there any reason to keep MAXCPU at 16 in the default kernel config? There are quite few servers on the market today that have 24 or even 32 physical cores. With hyper-threading this can even go as high as 48 or 64 virtual cpus. People who buy such hardware might get very disappointed

Re: Bumping MAXCPU on amd64?

2010-09-22 Thread pluknet
2010/9/22 Maxim Sobolev sobo...@freebsd.org: Hi, Is there any reason to keep MAXCPU at 16 in the default kernel config? There are quite few servers on the market today that have 24 or even 32 physical cores. With hyper-threading this can even go as high as 48 or 64 virtual cpus. People who

Re: Bumping MAXCPU on amd64?

2010-09-22 Thread John Baldwin
On Wednesday, September 22, 2010 6:36:56 am Maxim Sobolev wrote: Hi, Is there any reason to keep MAXCPU at 16 in the default kernel config? There are quite few servers on the market today that have 24 or even 32 physical cores. With hyper-threading this can even go as high as 48 or 64

Re: Bumping MAXCPU on amd64?

2010-09-22 Thread Curtis Penner
MAXCPU at 32 has been good in the 32bit days. Soon there will be (if not already) systems that will have 16cores/socket or more, and motherboards that have 4 sockets or more. Combining this with hyper-threading, you have gone significantly beyond the limits of feasible server. Bumping the

Re: Bumping MAXCPU on amd64?

2010-09-22 Thread pluknet
2010/9/22 Curtis Penner curtis.penn...@gmail.com: MAXCPU at 32 has been good in the 32bit days.  Soon there will be (if not already) systems that will have 16cores/socket or more, and motherboards that have 4 sockets or more.  Combining this with hyper-threading, you have gone significantly

Re: Bumping MAXCPU on amd64?

2010-09-22 Thread John Baldwin
On Wednesday, September 22, 2010 1:08:30 pm Curtis Penner wrote: MAXCPU at 32 has been good in the 32bit days. Soon there will be (if not already) systems that will have 16cores/socket or more, and motherboards that have 4 sockets or more. Combining this with hyper-threading, you have

Re: Bumping MAXCPU on amd64?

2010-09-22 Thread Maxim Sobolev
On 9/22/2010 6:37 AM, John Baldwin wrote: Unfortunately this can't be MFC'd to 7 as it would destroy the ABI for existing klds. Ah, ok, sorry, I did only check RELENG_7. Can we make it a kernel option then? Regards, -- Maksym Sobolyev Sippy Software, Inc. Internet Telephony (VoIP) Experts