Date: Mon, 1 Aug 2016 14:25:06 +0300 From: Slawa Olhovchenkov <slw@zxy.spb.ru> To: Andriy Gapon <avg@FreeBSD.org> Cc: Mateusz Guzik <mjguzik@gmail.com>, freebsd-current@FreeBSD.org Subject: Re: [PATCH] randomized delay in locking primitives, take 2 Message-ID: <20160801112506.GB22212@zxy.spb.ru> In-Reply-To: <32aa8f7f-8096-740c-13e3-d51e0cb57c23@FreeBSD.org> References: <20160731095706.GB9408@dft-labs.eu> <32aa8f7f-8096-740c-13e3-d51e0cb57c23@FreeBSD.org>
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On Mon, Aug 01, 2016 at 02:16:59PM +0300, Andriy Gapon wrote: > > Mateusz, > > just out of curiosity, have you tried to explore alternative spinlock > implementations like a ticket lock? It would be interesting to see if > there are any improvements to be gained there. Effective ticket lock implementation as I see limited to 256 (255?) concurent locks. And anyway may be need randomize delay (QPI bus on x86 have very limited performance).help
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