Re: [hybi] Background info: Properties of sendfile()
Jack Moffitt <jack@collecta.com> Fri, 06 August 2010 13:49 UTC
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Date: Fri, 06 Aug 2010 07:49:41 -0600
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From: Jack Moffitt <jack@collecta.com>
To: Willy Tarreau <w@1wt.eu>
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Cc: "Roy T. Fielding" <fielding@gbiv.com>, "hybi@ietf.org" <hybi@ietf.org>
Subject: Re: [hybi] Background info: Properties of sendfile()
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> At least I've seen it. Haproxy happily forwards traffic at 10 Gbps > with only 25% of one CPU core on a 2.66 GHz Core2Duo using splice(). > And some file sharing sites make a big use of it ! Without splice, > it hardly achieves 10 Gbps at 100% CPU. It's not clear how much of the benefit we'd lose with fixed size lengths (and therefore mandatory chunking). At this point, it seems that kind of data would be valuable. The tradeoff *seems* to be simple intermediaries versus sendfile()/splice() efficiency. If sendfile() is severely affected, it may make sense to make the intermediaries life slightly more complicated. If not, I think we keep their job simple. jack.
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