Date: Thu, 17 Jan 2019 16:43:17 -0800 From: Conrad Meyer <cem@freebsd.org> To: Kevin Bowling <kevin.bowling@kev009.com> Cc: src-committers <src-committers@freebsd.org>, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: Re: svn commit: r343125 - head/sys/dev/ioat Message-ID: <CAG6CVpUa2fFMEW=LkQXp4Qi219CkvcQ0DfDboBFP8xGAE=v=_g@mail.gmail.com> In-Reply-To: <CAK7dMtDYn1YibihevChTP8SBN1wjC3A1VBzXxdfsTPquhDwCyw@mail.gmail.com> References: <201901172321.x0HNL2f4036088@repo.freebsd.org> <CAK7dMtDYn1YibihevChTP8SBN1wjC3A1VBzXxdfsTPquhDwCyw@mail.gmail.com>
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On Thu, Jan 17, 2019 at 4:12 PM Kevin Bowling <kevin.bowling@kev009.com> wrote: > > Out of curiosity are you using this driver? Any performance data? Yep. I don't have any hard numbers on hand but my recollection is it caps out at about 5 GB/s, total, on Broadwell. Our workload with it is predominantly unmapped 8kB copies but includes some 512 byte copies as well. My recollection is that the channels are logical and share a single DMA engine, so there's not much reason to use more than one of them. It may improve on future microarchs but I can't speak to those. Cheers, Conrad
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