From: Bill Fink <billfink@mindspring.com>
To: LinuxPPC Developers <linuxppc-dev@lists.linuxppc.org>
Cc: Bill Fink <billfink@mindspring.com>
Subject: Re: IBM java: Turning on SMP seems more and more likely the key
Date: Tue, 28 May 2002 20:54:28 -0400 [thread overview]
Message-ID: <20020528205428.23b9a61b.billfink@mindspring.com> (raw)
On Tue May 28 2002, Graham Leggett wrote:
> James Gunning wrote:
>
> > Have just verified that toggling SMP *on* is the critical
> > switch to get the IBM java to go.
>
> Had the same result here: SMP kernel + java = works.
>
> Trouble is the SMP kernel is noticably slower than the non SMP kernel on
> non SMP systems.
My best guess is that the bug is somewhere in /usr/src/linux/mm/slab.c
since that is the only part of the MM code that's dependent on CONFIG_SMP.
One difference I see is that the SMP code uses kmem_cache_alloc_batch
which is a real function, whereas the non-SMP code uses kmem_cache_alloc_one
which is a macro. Also the SMP code writes something to the /proc file
system while the non-SMP code does not. But I don't see anything obviously
wrong, although I'm certainly no expert in this area.
-Bill
** Sent via the linuxppc-dev mail list. See http://lists.linuxppc.org/
next reply other threads:[~2002-05-29 0:54 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-05-29 0:54 Bill Fink [this message]
2002-05-29 3:07 ` IBM java: Turning on SMP seems more and more likely the key Bill Fink
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