From: Ingo Molnar <mingo@elte.hu> To: Roy Sigurd Karlsbakk <roy@karlsbakk.net> Subject: Re: speed difference between using hard-linked and modular drives? Date: Thu, 8 Nov 2001 18:37:57 +0100 (CET) Cc: <linux-kernel@vger.kernel.org> On Thu, 8 Nov 2001, Ingo Molnar wrote: > > Are there any speed difference between hard-linked device drivers and > > their modular counterparts? > > minimal. a few instructions per IO. Arjan pointed out that there is also the cost of TLB misses due to vmalloc()-ing module libraries, which can be as high as a 5% slowdown. we should fix this by trying to allocate continuous physical memory if possible, and fall back to vmalloc() only if this allocation fails. Ingo - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/