From: Linus Torvalds Date: Fri, 11 Jan 2008 16:03:13 GMT Subject: Re: Decompression speed: zip vs lzo Message-ID: In-Reply-To: <47870CDF.4010606@vilain.net> On Fri, 11 Jan 2008, Sam Vilain wrote: > > The difference seems only barely measurable; Ok. It may be that it might help other cases, but that seems unlikely. The more likely answer is that it's either of: - yes, zlib uncompression is noticeable in profiles, but that the cold-cache access is simply the bigger problem, and getting rid of zlib just moves the expense to whatever other thing that needs to access it (memcpy, xdelta apply, whatever) or - I don't know exactly which patch you used (did you just do the "core.deltacompression=0" thing?), and maybe zlib is fairly expensive even for just the setup crud, even when it doesn't really need to be. but who knows.. Linus