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Message-ID: <652016d30612180439y6cd12089l115e4ef6ce2e59fe@mail.gmail.com> Date: Mon, 18 Dec 2006 18:24:39 +0545 From: "Manish Regmi" <regmi.manish@...il.com> To: "Arjan van de Ven" <arjan@...radead.org> Cc: linux-kernel@...r.kernel.org, kernelnewbies@...linux.org Subject: Re: Linux disk performance. On 12/18/06, Arjan van de Ven <arjan@...radead.org> wrote: > if you want truely really smooth writes you'll have to work for it, > since "bumpy" writes tend to be better for performance so naturally the > kernel will favor those. > > to get smooth writes you'll need to do a threaded setup where you do an > msync/fdatasync/sync_file_range on a frequent-but-regular interval from > a thread. Be aware that this is quite likely to give you lower maximum > performance than the batching behavior though. > Thanks... But isn't O_DIRECT supposed to bypass buffering in Kernel? Doesn't it directly write to disk? I tried to put fdatasync() at regular intervals but there was no visible effect. -- --------------------------------------------------------------- regards Manish Regmi --------------------------------------------------------------- UNIX without a C Compiler is like eating Spaghetti with your mouth sewn shut. It just doesn't make sense. - 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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