Date: Fri, 13 Sep 2013 20:20:08 -0700 From: Adrian Chadd <adrian@freebsd.org> To: Rick Macklem <rmacklem@uoguelph.ca> Cc: "Alexander V. Chernikov" <melifaro@yandex-team.ru>, Luigi Rizzo <luigi@freebsd.org>, Andre Oppermann <andre@freebsd.org>, "freebsd-hackers@freebsd.org" <freebsd-hackers@freebsd.org>, FreeBSD Net <net@freebsd.org>, "Andrey V. Elsukov" <ae@freebsd.org>, "freebsd-arch@freebsd.org" <freebsd-arch@freebsd.org> Subject: Re: Network stack changes Message-ID: <CAJ-VmonWMzwNOyBJKyRMiF0_PUAtTd%2BJ4tx33Fnp0m3ModgCzA@mail.gmail.com> In-Reply-To: <221093226.23439826.1379112203059.JavaMail.root@uoguelph.ca> References: <6BDA4619-783C-433E-9819-A7EAA0BD3299@neville-neil.com> <221093226.23439826.1379112203059.JavaMail.root@uoguelph.ca>
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On 13 September 2013 15:43, Rick Macklem <rmacklem@uoguelph.ca> wrote: > And any time you increase latency, that will have a negative impact on > NFS performance. NFS RPCs are usually small messages (except Write requests > and Read replies) and the RTT for these (mostly small, bidirectional) > messages can have a significant impact on NFS perf. > Hi, the penalties to go to main memory quite a few times each time we process a frame is expensive. If we can get some better behaviour through batching leading to more efficient cache usage, it may not actually _have_ a delay. But, that requires a whole lot of design stars to align. And I'm still knee deep elsewhere, so I haven't really finished getting up to speed with what everyone else has done / said about it.. -adrian
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