Performance difference between UFS and ZFS with NFS

[Steven Hartland]

Just tried this here and I'm seeing CPU saturation from dd, is this
your case too?

Switching to:
/usr/bin/time -h dd if=/dev/zero of=/home/smh/testfile bs=1m count=2930

Iit changed from:
3072000000 bytes transferred in 170.102366 secs (18059714 bytes/sec)
        2m50.48s real           1.05s user              2m48.28s sys

to:
3072327680 bytes transferred in 14.094856 secs (217975102 bytes/sec)
        15.19s real             0.00s user              4.87s sys

    Regards
    Steve
----- Original Message ----- 
From: "Steven Hartland" <killing at multiplay.co.uk>
To: "Eric Browning" <ericbrowning at skaggscatholiccenter.org>
Cc: "FreeBSD FS" <freebsd-fs at freebsd.org>
Sent: Monday, November 25, 2013 6:20 PM
Subject: Re: Performance difference between UFS and ZFS with NFS


> And whats your ZFS pool layout and ashift?
>
>    Regards
>    Steve
> ----- Original Message ----- 
> From: "Eric Browning" <ericbrowning at skaggscatholiccenter.org>
>
>
>>I am using /dev/zero
>>
>> /usr/bin/time -h dd if=/dev/zero of=sometestfile bs=1024 count=3000000
>>
>>
>> On Sun, Nov 24, 2013 at 12:31 PM, krad <kraduk at gmail.com> wrote:
>>
>>> I was thinking the same, if it was using /dev/zero as an input any
>>> compression would skew the results a little.
>>>
>>>
>>> On 24 November 2013 15:15, Steven Hartland <killing at multiplay.co.uk>wrote:
>>>
>>>> ----- Original Message ----- From: "Eric Browning"
>>>>
>>>>
>>>>
>>>>  On a side note I forgot that I had used dd to test the disk performance a
>>>>> while ago when I was using ZFS.
>>>>>
>>>>> ZFS performance:
>>>>> 3072000000 bytes transferred in 34.167480 secs (89910055 bytes/sec)
>>>>> 34.17s real 0.61s user 31.89s sys
>>>>>
>>>>> UFS performance:
>>>>> 3072000000 bytes transferred in 11.848883 secs (259264942 bytes/sec)
>>>>> 11.85s real 0.58s user 11.25s sys
>>>>>
>>>>> Again, even with dd performance is about 3x faster with UFS with the same
>>>>> disks.
>>>>>
>>>>
>>>> Interesting, what was you command exactly?
>>>>
>>>>    Regards
>>>>    Steve
>>>>
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>>
>>
>> -- 
>> Eric Browning
>> Systems Administrator
>> 801-984-7623
>>
>> Skaggs Catholic Center
>> Juan Diego Catholic High School
>> Saint John the Baptist Middle
>> Saint John the Baptist Elementary
>>
>
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