Actually, the broken zero-copy for data is discouraging. I think the
way we could do is rearrange the layout of journal entry, just like
message we make journal header and payload(extra encoding bytes
without data), then data and footer. I think it should be a easy adapt
change?
On Fri, Nov 20, 20
Do you see any performance difference between direct io and non direct io
mode?
If it¹s disabled, you don¹t need any buffer alignment.
On 11/20/15, 5:29 AM, "ceph-devel-ow...@vger.kernel.org on behalf of
Haomai Wang" wrote:
>On Fri, Nov 20, 2015 at 9:08 PM, Sage Weil wrote:
>> On Fri, 20 Nov 20
On Fri, Nov 20, 2015 at 9:08 PM, Sage Weil wrote:
> On Fri, 20 Nov 2015, Haomai Wang wrote:
>> On Fri, Nov 20, 2015 at 7:41 PM, Sage Weil wrote:
>> > On Fri, 20 Nov 2015, changtao381 wrote:
>> >> Hi All,
>> >>
>> >> Thanks for you apply!
>> >>
>> >> If directioIO + async IO requirement that align
On Fri, Nov 20, 2015 at 7:41 PM, Sage Weil wrote:
> On Fri, 20 Nov 2015, changtao381 wrote:
>> Hi All,
>>
>> Thanks for you apply!
>>
>> If directioIO + async IO requirement that alignment, it shouldn't aligned by
>> PAGE for each journal entry.
>> For it may write many entries of journal once ti
...@ts.fujitsu.com [mailto:piotr.da...@ts.fujitsu.com]
>> 发送时间: 2015年11月20日 16:42
>> 收件人: changtao381; ceph-devel@vger.kernel.org
>> 主题: RE: journal alignment
>>
>>> -Original Message-
>>> From: ceph-devel-ow...@vger.kernel.org [mailto:ceph-devel-
&g
原件-
> 发件人: piotr.da...@ts.fujitsu.com [mailto:piotr.da...@ts.fujitsu.com]
> 发送时间: 2015年11月20日 16:42
> 收件人: changtao381; ceph-devel@vger.kernel.org
> 主题: RE: journal alignment
>
>> -Original Message-
>> From: ceph-devel-ow...@vger.kernel.org [mailto:ceph-devel-
>> ow
write] ? Am I right?
-邮件原件-
发件人: piotr.da...@ts.fujitsu.com [mailto:piotr.da...@ts.fujitsu.com]
发送时间: 2015年11月20日 16:42
收件人: changtao381; ceph-devel@vger.kernel.org
主题: RE: journal alignment
> -Original Message-
> From: ceph-devel-ow...@vger.kernel.org [mailto:ceph-
> -Original Message-
> From: ceph-devel-ow...@vger.kernel.org [mailto:ceph-devel-
> ow...@vger.kernel.org] On Behalf Of changtao381
> Sent: Friday, November 20, 2015 9:33 AM
>
> HI All,
>
> Why it is needed an entry of journal t is aligned by CEPH_PAGE_MASK ? For
> it causes the data o
On Fri, Nov 20, 2015 at 4:33 PM, changtao381 wrote:
> HI All,
>
> Why it is needed an entry of journal t is aligned by CEPH_PAGE_MASK ? For
> it causes the data of journal write are amplified by 2X for small io
>
linux aio/dio required this
> For example write io size 4096 bytes, it may write
HI All,
Why it is needed an entry of journal t is aligned by CEPH_PAGE_MASK ? For
it causes the data of journal write are amplified by 2X for small io
For example write io size 4096 bytes, it may write 8192 bytes
prepare_single_write 2 will write 98304 : seq 24 len 4324 -> 8192 (head 40
pre_p
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