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Message-ID: <BAY20-F1927988DDB55A274D2DAAFF9650@phx.gbl> Date: Thu, 05 Apr 2007 16:26:59 +0000 From: "Paa Paa" <paapaa125@...mail.com> To: linux-kernel@...r.kernel.org Subject: Re: Lower HD transfer rate with NCQ enabled? Mark Lord wrote: >>>This is mostly a problem with the WD Raptor drive, and some other WD >>>drives. >>>I have not yet encountered/noticed the problem with other brands. >> >>Sounds like this is a serious bug in the WD firmware. > >For personal systems, yes. For servers, probably not a bug. In my case the choice of IO scheduler affected the result of "hdparm -t" significantly. With Deadline I got identical result with NCQ and wihout NCQ. It was only with CFQ when I got worse results with NCQ than without it. What might be the reason CFQ+NCQ gived so much worse throughput with "hdparm -t"? _________________________________________________________________ Express yourself instantly with MSN Messenger! Download today it's FREE! http://messenger.msn.click-url.com/go/onm00200471ave/direct/01/ - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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