| From: | Claudio Freire <klaussfreire(at)gmail(dot)com> |
|---|---|
| To: | Jim Nasby <jim(at)nasby(dot)net> |
| Cc: | Gregory Smith <gregsmithpgsql(at)gmail(dot)com>, Mel Gorman <mgorman(at)suse(dot)de>, Jeff Janes <jeff(dot)janes(at)gmail(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>, Robert Haas <robertmhaas(at)gmail(dot)com>, 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: | 2014-01-23 01:52:25 |
| Message-ID: | CAGTBQpZvsB3dVOfUNdwdAvKyVvuWBi3W_=A1-nUGNuSQJhT6Bg@mail.gmail.com |
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| Lists: | pgsql-hackers |
On Wed, Jan 22, 2014 at 10:08 PM, Jim Nasby <jim(at)nasby(dot)net> wrote:
>
> Probably more useful is the case of index scans; if we pre-read more data
> from the index we could hand the kernel a list of base relation blocks that
> we know we'll need.
Actually, I've already tried this. The most important part is fetching
heap pages, not index. Tried that too.
Currently, fadvising those pages works *in detriment* of physically
correlated scans. That's a kernel bug I've reported to LKML, and I
could probably come up with a patch. I've just never had time to set
up the testing machinery to test the patch myself.
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