Disappointing speed with ZFS

Ivan Voras ivoras at freebsd.org
Mon Feb 11 18:13:16 UTC 2008


Alexey Tarasov wrote:
> ls -lash CentOS-5.1-x86_64-bin-DVD.iso
> 
> 4341952 -rw-r--r--  1 lexa  wheel   4,1G  7 фев 16:24
> CentOS-5.1-x86_64-bin-DVD.iso
> 
> `--# dd if=CentOS-5.1-x86_64-bin-DVD.iso of=test2

Ok, now try this one:
# dd if=CentOS-5.1-x86_64-bin-DVD.iso of=/dev/null bs=1m

> 
>       tty             ad4              ad5              ad6             cpu
>  tin tout  KB/t tps  MB/s   KB/t tps  MB/s   KB/t tps  MB/s  us ni sy in id
>    0  351  7.33   1  0.01  57.37  44  2.44  43.02  44  1.87   1  0  1  0 98
>    0  594  0.00   0  0.00  59.00  15  0.89  62.63 301 18.38   0  0  9  0 91
>    0  287  0.00   0  0.00  59.20  25  1.44  64.00 325 20.29   1  0 50  0 49

> On 11.02.2008, at 20:53, Ivan Voras wrote:
> 
>> Alexey Tarasov wrote:
>>
>>> `--# dd if=test.tmp of=test2.tmp
>>
>>>
>>>      tty             ad4              ad5             
>>> ad6             cpu
>>> tin tout  KB/t tps  MB/s   KB/t tps  MB/s   KB/t tps  MB/s  us ni sy
>>> in id
>>>   1  238  0.00   0  0.00  60.22  18  1.04  64.00 982 61.37   1  0 31 
>>> 2 67
>>>   1 3349  0.00   0  0.00  64.00   7  0.43  58.53 757 43.26   1  0 46 
>>> 0 53
>>>   0  286  0.00   0  0.00  55.81  21  1.13  64.00 487 30.43   1  0 31 
>>> 1 67
>>>   0  269  0.00   0  0.00  64.00   8  0.50  64.00  21  1.31   2  0 49 
>>> 0 49
>>
>> Ok, now do the same with the file that rtorrent is hashing in the "if"
>> argument.



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