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Re: [Qemu-block] [RFC v6] RBD: Add support readv,writev for rbd
From: |
Jaze Lee |
Subject: |
Re: [Qemu-block] [RFC v6] RBD: Add support readv,writev for rbd |
Date: |
Wed, 22 Feb 2017 17:47:46 +0800 |
2017-02-22 17:36 GMT+08:00 Kevin Wolf <address@hidden>:
> Am 22.02.2017 um 10:29 hat Jaze Lee geschrieben:
>> 2017-02-22 17:17 GMT+08:00 Kevin Wolf <address@hidden>:
>> > Am 22.02.2017 um 10:05 hat Jaze Lee geschrieben:
>> >> I test on cache=none with sata disk, because i do not have ssd in my pc,
>> >> and I do not find any performance improved.
>> >>
>> >> I do not know why the performance is not be improved....
>> >
>> > Most likely your disk is just too slow for the memory copy to make any
>> > significant difference, and the memcpy cost is dwarved by the actual
>> > disk I/O cost.
>> >
>> > Have you tried backing the server with a ramdisk instead?
>>
>> No yet...
>>
>> Do you mean I should use ramdisk as the root disk of the vm?
>> then attach the rbd volume to it?
>
> Did you intentionally drop the mailing list CC?
Sorry, it is not intentional.....
>
> No, the VM should just directly use rbd as it used to. It's the rbd
> server that should operate on a ramdisk rather than your SATA disk,
> so that you get any physical disk out of the way (because physical
> disks, and even more so spinning rust, make things slow).
Oh, I think i should change to another host, with large memory....
Thank you.
>
> Kevin
--
谦谦君子
- [Qemu-block] [RFC v6] RBD: Add support readv,writev for rbd, jazeltq, 2017/02/20
- [Qemu-block] [RFC v6] RBD: Add support readv,writev for rbd, jazeltq, 2017/02/21
- Re: [Qemu-block] [RFC v6] RBD: Add support readv,writev for rbd, Jaze Lee, 2017/02/21
- Re: [Qemu-block] [RFC v6] RBD: Add support readv,writev for rbd, Stefan Hajnoczi, 2017/02/21
- Re: [Qemu-block] [RFC v6] RBD: Add support readv,writev for rbd, Jaze Lee, 2017/02/22
- Re: [Qemu-block] [RFC v6] RBD: Add support readv,writev for rbd, Kevin Wolf, 2017/02/22
- Message not available
- Message not available
- Re: [Qemu-block] [RFC v6] RBD: Add support readv,writev for rbd,
Jaze Lee <=
Re: [Qemu-block] [RFC v6] RBD: Add support readv,writev for rbd, Jeff Cody, 2017/02/23