Disappointing speed with ZFS

Alexey Tarasov me at lexasoft.ru
Mon Feb 11 18:09:48 UTC 2008


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


       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
    0  328  0.00   0  0.00  55.11  18  0.97  64.00 291 18.17   1  0  
49  1 49
    0  264 16.00   1  0.02  53.33  12  0.62  64.00 345 21.55   2  0  
36  0 62
    0  285 19.50  32  0.61  54.73  22  1.17  64.00 320 19.98   1  0  
52  1 47
    0  341  0.00   0  0.00  64.00  17  1.06  64.00 365 22.78   1  0  
47  1 51
    0  345  0.00   0  0.00  52.50  16  0.81  64.00 328 20.49   1  0  
32  1 66
    0  299  0.00   0  0.00  57.38  26  1.46  64.00 302 18.86   2  0  
49  0 49
    0  308  0.00   0  0.00  58.59  17  0.94  60.70 383 22.73   0  0  
16  0 84
    0  307  0.00   0  0.00  46.06  33  1.48  54.20 369 19.51   1  0  
51  0 48
    0  305  0.00   0  0.00  51.80  20  1.01  63.38 303 18.74   1  0  
47  0 52
    0  269  0.00   0  0.00  54.86  21  1.11  63.78 285 17.73   1  0  
37  0 62
    0  307  0.00   0  0.00  55.56  18  0.98  64.00 285 17.79   0  0  
50  2 48
    0  267  4.00   1  0.00  53.33  12  0.60  63.86 868 54.16   0  0   
4  0 96
    0  300  6.71  28  0.18  56.70  23  1.26  63.75 505 31.43   0  0  
47  2 52
    0  307  0.00   0  0.00  60.55  22  1.30  64.00 694 43.39   1  0  
67  2 30
    0  309  0.00   0  0.00  52.42  19  0.97  64.00 967 60.44   0  0  
61  1 38
    0  286  0.00   0  0.00  50.91  21  1.07  62.91 380 23.36   0  0  
20  1 79
    0  301  0.00   0  0.00  58.74  18  1.05  64.00 606 37.87   0  0   
4  1 95


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.
>
> You should have used "bs=1m" for both tests, but it's too late now -  
> do
> the other test also without "bs".
>
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--
Alexey Tarasov

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