On Sat, Jul 15, 2017 at 8:00 PM, Ruben Rodriguez wrote:
>
>
> On 14/07/17 18:43, Ruben Rodriguez wrote:
>> How to reproduce...
>
> I'll provide more concise details on how to test this behavior:
>
> Ceph config:
>
> [client]
> rbd readahead max bytes = 0 # we don't want forced readahead to fool us
--Original Message-
>>> From: ceph-users [mailto:ceph-users-boun...@lists.ceph.com] On Behalf Of
>>> Gregory Farnum
>>> Sent: 15 July 2017 00:09
>>> To: Ruben Rodriguez
>>> Cc: ceph-users
>>> Subject: Re: [ceph-users] RBD cache being fil
On Sat, Jul 15, 2017 at 5:35 PM, Ruben Rodriguez wrote:
>
>
> On 15/07/17 15:33, Jason Dillaman wrote:
>> On Sat, Jul 15, 2017 at 9:43 AM, Nick Fisk wrote:
>>> Unless you tell the rbd client to not disable readahead after reading the
>>> 1st x number of bytes (rbd readahead disable after bytes=0
On 14/07/17 18:43, Ruben Rodriguez wrote:
> How to reproduce...
I'll provide more concise details on how to test this behavior:
Ceph config:
[client]
rbd readahead max bytes = 0 # we don't want forced readahead to fool us
rbd cache = true
Start a qemu vm, with a rbd image attached with virtio
On 15/07/17 09:43, Nick Fisk wrote:
>> -Original Message-
>> From: ceph-users [mailto:ceph-users-boun...@lists.ceph.com] On Behalf Of
>> Gregory Farnum
>> Sent: 15 July 2017 00:09
>> To: Ruben Rodriguez
>> Cc: ceph-users
>> Subject: Re: [ceph
On 15/07/17 15:33, Jason Dillaman wrote:
> On Sat, Jul 15, 2017 at 9:43 AM, Nick Fisk wrote:
>> Unless you tell the rbd client to not disable readahead after reading the
>> 1st x number of bytes (rbd readahead disable after bytes=0), it will stop
>> reading ahead and will only cache exactly wh
On Sat, Jul 15, 2017 at 9:43 AM, Nick Fisk wrote:
> Unless you tell the rbd client to not disable readahead after reading the 1st
> x number of bytes (rbd readahead disable after bytes=0), it will stop reading
> ahead and will only cache exactly what is requested by the client.
The default is t
> -Original Message-
> From: ceph-users [mailto:ceph-users-boun...@lists.ceph.com] On Behalf Of
> Gregory Farnum
> Sent: 15 July 2017 00:09
> To: Ruben Rodriguez
> Cc: ceph-users
> Subject: Re: [ceph-users] RBD cache being filled up in small increases instead
> of
On Fri, Jul 14, 2017 at 3:43 PM, Ruben Rodriguez wrote:
>
> I'm having an issue with small sequential reads (such as searching
> through source code files, etc), and I found that multiple small reads
> withing a 4MB boundary would fetch the same object from the OSD multiple
> times, as it gets ins
I'm having an issue with small sequential reads (such as searching
through source code files, etc), and I found that multiple small reads
withing a 4MB boundary would fetch the same object from the OSD multiple
times, as it gets inserted into the RBD cache partially.
How to reproduce: rbd image a
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