Date: Tue, 8 Nov 2011 23:02:52 -0800 From: Garrett Cooper <yanegomi@gmail.com> To: "Daniel O'Connor" <doconnor@gsoft.com.au> Cc: Kurt Touet <ktouet@gmail.com>, freebsd-current@freebsd.org, Dan The Man <dan@sunsaturn.com> Subject: Re: samba+zfs Message-ID: <CAGH67wRJkN%2BsDhxxMVSZx3RXQJm5xyyfW9iwiY1FrkFxLu%2BTWQ@mail.gmail.com> In-Reply-To: <F8AEDB62-4C76-4D95-8CBA-6C58B54C1965@gsoft.com.au> References: <alpine.BSF.2.00.1110272039500.50739@sunsaturn.com> <CAGH67wRZZx0hG9ug2k-5ohCOPJ9sZOU9iFVKg7hv9WM=R761GA@mail.gmail.com> <alpine.BSF.2.00.1111080259270.89703@sunsaturn.com> <alpine.BSF.2.00.1111080328010.89703@sunsaturn.com> <CALM%2B6aJkF=CFq8LA3FrSMYo8La-8txK4h2p4yZtdHshskBU6Vw@mail.gmail.com> <alpine.BSF.2.00.1111082015260.93923@sunsaturn.com> <CALM%2B6aJiM%2BNfikax9vNiYzBJqo3B8WLEXiZgrjUUQa9ngCQaKg@mail.gmail.com> <B4FEAF5B-52AC-40E5-90A3-7BD060BB7A73@gsoft.com.au> <F8AEDB62-4C76-4D95-8CBA-6C58B54C1965@gsoft.com.au>
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On Tue, Nov 8, 2011 at 10:28 PM, Daniel O'Connor <doconnor@gsoft.com.au> wr=
ote:
>
> On 09/11/2011, at 16:56, Daniel O'Connor wrote:
>> On 09/11/2011, at 16:29, Kurt Touet wrote:
>>> Is anyone else seeing problems like this with samba/zfs ? =A0 =A0Perhap=
s
>>> it's not exclusive to samba, either?
>>
>> Yep, I see this too.
>>
>> I can get 80-100Mbyte/sec reads out of a single disk but ZFS is (now) ve=
ry slow - it reads & writes and much more slowly (10-30MB/sec).
>>
>> When the array was fresh it was nice and fast - it is now 68% full and h=
asn't been much more full than that (I don't know but am pretty sure it nev=
er reach past 75%).
>>
>> The frustrating thing is trying to find some way of measuring what's act=
ually going on.. I haven't had much luck :
>
>
> Note that this is not restricted to Samba and while the server is not com=
pletely idle it's not doing very much.
>
> dd's of large files (spooled backups going to tape) to /dev/null are as s=
low as Samba.
- Dedupe?
- Compression?
- How much RAM?
- What debug options do you have enabled in the kernel?
I've been noticing a slowdown in some respects with NFS/SMB, but I
suspected it was because I have an re(4) based NIC. ZFS has also wired
down a lot of my system memory for the L2ARC...
Thanks,
-Garrett
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