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Date: Tue, 4 Mar 2014 10:17:40 +1100 From: Dave Chinner <david@...morbit.com> To: Fengguang Wu <fengguang.wu@...el.com> Cc: Dave Chinner <dchinner@...hat.com>, linux-fsdevel@...r.kernel.org, LKML <linux-kernel@...r.kernel.org> Subject: Re: [xfs] f876e446: +1.2% fileio.requests_per_sec On Mon, Mar 03, 2014 at 10:21:51PM +0800, Fengguang Wu wrote: > Hi Dave, > > We noticed the below changes on commit f876e44603ad091c840a5fae5b0753bbb421c037 > ("xfs: always do log forces via the workqueue"): > > Basically there are +1.2% increased throughput with +29.5% increased > context switches. Yes, the increase in context switches is expected. Every sync IO causes a log force if it changed inode metadata, and the above commit, as it describes, moves them to a work queue. Hence there's more context switches involved in a log force that has to do work. Cheers, Dave. -- Dave Chinner david@...morbit.com -- 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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