Re: syncfs slower than without syncfs

[Mark Nelson <mark.nelson@inktank.com>]

Whew, glad you found the problem Stefan!  I was starting to wonder what 
was going on. :)  Do you mind filling a bug about the control dependencies?

Mark

On 11/07/2012 07:31 AM, Stefan Priebe - Profihost AG wrote:
> Am 07.11.2012 10:41, schrieb Stefan Priebe - Profihost AG:
>> Hello list,
>>
>> syncfs is much slower than without syncfs to me.
>>
>> If i compile latest ceph master with wip-rbd-read:
>>
>> with syncfs:
>> rand 4K:
>>    write: io=1133MB, bw=12853KB/s, iops=3213, runt= 90277msec
>>    read : io=1239MB, bw=14046KB/s, iops=3511, runt= 90325msec
>> seq 4M:
>>    write: io=37560MB, bw=423874KB/s, iops=103, runt= 90738msec
>>    read : io=103852MB, bw=1151MB/s, iops=287, runt= 90237msec
>>
>> without syncfs:
>> rand 4K:
>>    write: io=3733MB, bw=42459KB/s, iops=10614, runt= 90039msec
>>    read : io=6018MB, bw=68446KB/s, iops=17111, runt= 90038msec
>> seq 4M:
>>    write: io=51204MB, bw=577328KB/s, iops=140, runt= 90820msec
>>    read : io=150320MB, bw=1666MB/s, iops=416, runt= 90228msec
>>
>> I thought syncfs should boost the performance.
>
> Fixed - my chroot env with glibc syncfs support didn't had the libcrypto
> installed and it isn't in the control dependencies. Now with libcrypto i
> get the same results as without syncfs.
>
> Stefan
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