| From: | Trond Myklebust <trondmy(at)gmail(dot)com> |
|---|---|
| To: | Robert Haas <robertmhaas(at)gmail(dot)com> |
| Cc: | Andres Freund <andres(at)2ndquadrant(dot)com>, Josh Berkus <josh(at)agliodbs(dot)com>, Kevin Grittner <kgrittn(at)ymail(dot)com>, "pgsql-hackers(at)postgresql(dot)org" <pgsql-hackers(at)postgresql(dot)org>, Joshua Drake <jd(at)commandprompt(dot)com>, Mel Gorman <mgorman(at)suse(dot)de>, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, "lsf-pc(at)lists(dot)linux-foundation(dot)org" <lsf-pc(at)lists(dot)linux-foundation(dot)org>, Magnus Hagander <magnus(at)hagander(dot)net> |
| Subject: | Re: [Lsf-pc] Linux kernel impact on PostgreSQL performance |
| Date: | 2014-01-13 21:06:04 |
| Message-ID: | 2CCCC0A9-49A0-4BBF-9D87-C56970F84BDE@gmail.com |
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| Lists: | pgsql-hackers |
On Jan 13, 2014, at 16:03, Robert Haas <robertmhaas(at)gmail(dot)com> wrote:
> On Mon, Jan 13, 2014 at 3:53 PM, Trond Myklebust <trondmy(at)gmail(dot)com> wrote:
>> O_DIRECT was specifically designed to solve the problem of double buffering between applications and the kernel. Why are you not able to use that in these situations?
>
> O_DIRECT was apparently designed by a deranged monkey on some serious
> mind-controlling substances. But don't take it from me, I have it on
> good authority:
>
> http://yarchive.net/comp/linux/o_direct.html
>
> One might even say the best authority.
You do realise that is 12 year old information, right? …and yes, we have added both aio and vectored operations to O_DIRECT in the meantime.
Meanwhile, no progress has been made on the “non-deranged” interface that authority was advocating.
Cheers,
Trond
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