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Message-Id: <200808191207.42550.opurdila@ixiacom.com> Date: Tue, 19 Aug 2008 12:07:42 +0300 From: Octavian Purdila <opurdila@...acom.com> To: Andrew Morton <akpm@...ux-foundation.org> Cc: linux-kernel@...r.kernel.org Subject: Re: [RFC] [PATCH] splice: add ->splice_read support for /dev/zero From: Andrew Morton <akpm@...ux-foundation.org> Date: Mon, 18 Aug 2008 21:43:18 -0700 > > Preallocating the zero page is simpler and faster with the relatively > > small (?) drawback of using an extra page of memory. > > How much faster is it? What workloads/benchmarks/etc? > I should have said "theoretically faster" :) I did not perform any tests, but, did I assumed correctly that it is going to be faster preallocating it then allocating it in every splice call? > > Maybe when CONFIG_EMBEDED is selected we can switch to dynamically > > allocating the page? > > One more page won't kill us. People might want one-page-per-node, too. > But that all depends on what the benefits and applications of this are.. Its the reverse of splice for /dev/null. Sometimes you don't care of the data pushed through the socket (e.g. protocol payload in networking testing). BTW, the patch its buggy, I'll send a new version for linux-next if you decide its worth it. Thanks, tavi -- 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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