Re: [Lsf-pc] Linux kernel impact on PostgreSQL performance

On Jan 13, 2014, at 16:03, Robert Haas <robertmhaas@gmail.com> wrote:

> On Mon, Jan 13, 2014 at 3:53 PM, Trond Myklebust <trondmy@gmail.com> wrote:
>> O_DIRECT was specifically designed to solve the problem of double buffering between applications and the kernel. Why
areyou 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_DIRECTin the meantime. 

Meanwhile, no progress has been made on the “non-deranged” interface that authority was advocating.

Cheers, Trond