From: Christoph Hellwig <hch@infradead.org>
To: Herbert Xu <herbert@gondor.apana.org.au>
Cc: Christoph Hellwig <hch@infradead.org>,
ganesh.venkatesan@intel.com, jgarzik@pobox.com,
netdev@oss.sgi.com, linux-kernel@vger.kernel.org
Subject: Re: [PATCH 3/12 2.4] e1000 - use vmalloc for data structures not shared with h/w
Date: Wed, 4 Aug 2004 17:48:56 +0100 [thread overview]
Message-ID: <20040804174856.B24545@infradead.org> (raw)
In-Reply-To: <E1BqoRX-0004DH-00@gondolin.me.apana.org.au>; from herbert@gondor.apana.org.au on Sat, Jul 31, 2004 at 05:38:11PM +1000
On Sat, Jul 31, 2004 at 05:38:11PM +1000, Herbert Xu wrote:
> > No, it's not. vmalloc needs virtual space that's rather limited (e.g. 64MB
> > on PAE x86) in addition to physical memory. Unless you do really big
> > allocations stay away from vmalloc.
>
> How big is really big? 64K? 256K? 1M?
Well, the VM deals with big-order (aka bigger than page size) allocations
rather bad, so for allocation during any I/O I'd stick to allocation smaller
than that (and certainly no vmalloc!), for init-time allocations order 1 is
fine, maybe even order 2 or three.
prev parent reply other threads:[~2004-08-04 16:49 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20040729192519.A6235@infradead.org>
2004-07-31 7:38 ` Herbert Xu
2004-08-04 16:48 ` Christoph Hellwig [this message]
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