From: | Stuart Bishop <stuart(at)stuartbishop(dot)net> |
---|---|
To: | "Joshua D(dot) Drake" <jd(at)commandprompt(dot)com> |
Cc: | Scott Marlowe <scott(dot)marlowe(at)gmail(dot)com>, "pgsql-general(at)postgresql(dot)org" <pgsql-general(at)postgresql(dot)org> |
Subject: | Re: PSA: If you are running Precise/12.04 upgrade your kernel. |
Date: | 2013-06-17 20:34:15 |
Message-ID: | CADmi=6M1FMXynHj8ov2-3PfPAVeD-UmKC81cp97UrnPj1sPkOw@mail.gmail.com |
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Lists: | pgsql-general |
On Fri, Jun 7, 2013 at 5:51 AM, Joshua D. Drake <jd(at)commandprompt(dot)com> wrote:
>
> On 06/06/2013 03:48 PM, Scott Marlowe wrote:
>>
>>
>> On Thu, Jun 6, 2013 at 4:35 PM, Joshua D. Drake <jd(at)commandprompt(dot)com>
>> wrote:
>>>
>>> I had the distinct displeasure of staying up entirely too late with a
>>> customer this week because they upgraded to 12.04 and immediately
>>> experienced a huge performance regression. In the process they also
>>> upgraded
>>> to PostgreSQL 9.1 from 8.4. There were a lot of knobs to
>>> change/fix/modify
>>> because of this. However, nothing I did fixed the problem. Until... I
>>> upgraded the kernel.
>>>
>>> Upgrading from 3.2Precise to the 3.9.4 kernel produced the following
>>> results:
>>
>>
>> I've since heard that 3.4 also fixes this issue as well.
>>
>> What are you using for your IO on these boxes?
>
> I was able to demonstrate it over iSCSI to a Nimble Storage SAN as well as
> DAS with 2 drive RAID 1 for xlogs and 8 drive RAID 10 for data (DL385 G7).
This might sound familiar:
tl;dr for that thread seems to be a driver problem (fusionIO?), I'm
unsure if Ubuntu specific or in the upstream kernel.
--
Stuart Bishop <stuart(at)stuartbishop(dot)net>
http://www.stuartbishop.net/
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