linux-kernel - Re: New filesystem for Linux

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Message-id: <454CE4EA.7030500@cosmosbay.com>
Date:	Sat, 04 Nov 2006 20:07:22 +0100
From:	Eric Dumazet <dada1@...mosbay.com>
To:	Mikulas Patocka <mikulas@...ax.karlin.mff.cuni.cz>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: New filesystem for Linux

Mikulas Patocka a écrit :
>> The problem with a per_cpu biglock is that you may consume a lot of 
>> RAM for big NR_CPUS. Count 32 KB per 'biglock' if NR_CPUS=1024
> 
> Does one Linux kernel run on system with 1024 cpus? I guess it must fry 
> spinlocks... (or even lockup due to spinlock livelocks)

Not here in my house, but I was told such beasts exist somewhere on this planet :)

You can have a kernel compiled with NR_CPUS=1024, but still run it on your 
laptop, with a single CPU available...

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