Date: Mon, 11 Feb 2008 20:33:33 +0300 From: Alexey Tarasov <me@lexasoft.ru> To: current@freebsd.org Subject: Re: Disappointing speed with ZFS Message-ID: <79D93B0C-589E-41C6-A952-6D573297D9F9@lexasoft.ru> In-Reply-To: <9bbcef730802110921i6af516b9t855a4065884cc64b@mail.gmail.com> References: <9DA6FFCD-11DB-4580-9314-52B0885351D8@lexasoft.ru> <fopmlp$qeh$1@ger.gmane.org> <0EF3CEE6-6F38-4713-A245-4354D34AFE75@lexasoft.ru> <9bbcef730802110921i6af516b9t855a4065884cc64b@mail.gmail.com>
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`--# dd if=3D/dev/zero of=3Dtest.tmp bs=3D1024k count=3D10000
load: 0.42 cmd: dd 30773 [zfs:(&tx->tx_quiesce_done_cv)] 0.01u 3.56s =20=
5% 1996k
2612+0 records in
2611+0 records out
2737831936 bytes transferred in 65.497687 secs (41800437 bytes/sec)
10000+0 records in
10000+0 records out
10485760000 bytes transferred in 211.643188 secs (49544519 bytes/sec)
`--# dd if=3Dtest.tmp of=3Dtest2.tmp
(AD6 is my device)
tty ad4 ad5 =20
ad6 cpu
tin tout KB/t tps MB/s KB/t tps MB/s KB/t tps MB/s us ni sy =20=
in id
1 238 0.00 0 0.00 60.22 18 1.04 64.00 982 61.37 1 0 =20
31 2 67
1 3349 0.00 0 0.00 64.00 7 0.43 58.53 757 43.26 1 0 =20
46 0 53
0 286 0.00 0 0.00 55.81 21 1.13 64.00 487 30.43 1 0 =20
31 1 67
0 269 0.00 0 0.00 64.00 8 0.50 64.00 21 1.31 2 0 =20
49 0 49
0 294 0.00 0 0.00 32.82 34 1.09 63.16 582 35.92 1 0 =20
49 2 48
0 278 0.00 0 0.00 60.00 15 0.86 64.00 983 61.45 0 0 =20
23 0 77
0 280 0.00 0 0.00 56.00 15 0.80 63.64 959 59.60 0 0 =20
23 2 75
0 297 0.00 0 0.00 62.55 11 0.67 47.94 197 9.21 1 0 =20
55 0 44
0 268 0.00 0 0.00 53.80 20 1.05 64.00 481 30.03 1 0 =20
52 0 48
0 290 0.00 0 0.00 57.71 14 0.79 63.23 597 36.89 1 0 =20
54 0 45
0 289 0.00 0 0.00 53.82 11 0.57 64.00 982 61.39 0 0 =20
27 1 71
0 276 0.00 0 0.00 57.18 17 0.94 63.32 963 59.56 0 0 =20
43 1 55
0 296 0.00 0 0.00 61.33 18 1.06 64.00 983 61.44 1 0 =20
37 1 61
0 280 0.00 0 0.00 61.60 14 0.87 63.83 927 57.79 0 0 =20
3 2 94
0 306 16.00 1 0.02 57.82 11 0.62 59.20 486 28.10 1 0 =20
46 0 53
0 251 0.00 0 0.00 62.77 13 0.79 63.17 933 57.57 1 0 =20
35 3 61
0 295 0.00 0 0.00 53.25 16 0.83 42.87 133 5.56 1 0 =20
51 0 48
0 293 0.00 0 0.00 58.00 10 0.57 64.00 501 31.34 2 0 =20
49 0 49
0 265 0.00 0 0.00 38.55 11 0.41 64.00 505 31.57 1 0 =20
33 1 65
0 299 0.00 0 0.00 54.67 18 0.96 62.65 76 4.65 0 0 =20
53 0 47
On 11.02.2008, at 20:21, Ivan Voras wrote:
> On 11/02/2008, Alexey Tarasov <me@lexasoft.ru> wrote:
>> I've done similar tests on the other machine, and all looks fine.
>>
>> But why on this machine ZFS works slower than UFS? When I make UFS
>> file system on the same disk, rtorrent hashing works 10 times faster.
>> And while hashing, HDD is used three times intensively with ZFS
>> (noticed by flashing LED).
>>
>> I have an amd64 Core2Duo processor, 4 Gb of RAM, what is not enough
>> for ZFS?
>>
>> What kernel tuning can help me?
>
> Ok, so you're saying that you've done similar testing (meaning
> rtorrent hashing) on other machines, and they work fine, but only this
> one is slow?
>
> There's no usual reason why would it be so.
>
> Can you try the suggestion I made (dd+iostat)?
--
Alexey Tarasov
(\__/)
(=3D'.'=3D)
E[: | | | | :]=D0=97
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