Date: Sun, 13 Jun 2010 15:03:16 +1000 From: Lawrence Stewart <lstewart@freebsd.org> To: Navdeep Parhar <np@FreeBSD.org> Cc: svn-src-head@FreeBSD.org, svn-src-all@FreeBSD.org, src-committers@FreeBSD.org Subject: Re: svn commit: r209116 - head/sys/dev/cxgb Message-ID: <4C146694.3000508@freebsd.org> In-Reply-To: <201006122233.o5CMX4Fc032367@svn.freebsd.org>
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Hi Navdeep, On 06/13/10 08:33, Navdeep Parhar wrote: > Log: > cxgb(4): add knob to get packet timestamps from the hardware. > > The T3 ASIC can provide an incoming packet's timestamp instead of its RSS hash. > The timestamp is just a counter running off the card's clock. With a 175MHz > clock an increment represents ~5.7ns and the 32 bit value wraps around in ~25s. > > # sysctl -d dev.cxgbc.0.pkt_timestamp > dev.cxgbc.0.pkt_timestamp: provide packet timestamp instead of connection hash > > # sysctl -d dev.cxgbc.0.core_clock > dev.cxgbc.0.core_clock: core clock frequency (in KHz) > # sysctl dev.cxgbc.0.core_clock > dev.cxgbc.0.core_clock: 175000 Is this really a "one or the other" feature, or is it technically possible to support both simultaneously at some point in the future if additional work was done? Just curious... Cheers, Lawrencehome | help
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