[Samba] samba 3 performance

[Alexander Lazarevich]

Hey Darcy,

I'm drooling over your setup. RAID6, way cool.

60MB/sec is double what we are getting. I'm stuck thinking it's some 
default XP Pro configuration that's keeping us at 30MB/sec. Did you 
have any trouble getting XP Pro above 30MB/sec? Doesn't sound like it.

Anyway, did you enable jumbo frames in your switches and NIC drivers? 
Also, in your smb.conf, did you try tweeking with the socket options. such 
as:

socket options = TCP_NODELAY IPTOS_LOWDELAY SO_KEEPALIVE
socket options = TCP_NODELAY SO_RCVBUF=16384 SO_SNDBUF=16384

Hope that helps, but I doubt it, you probably already tried that stuff.

Alex


On Wed, 27 Apr 2005, Darcy Bangsund wrote:

> Hey Alexander
> Having similar issues as you were on the same hardware. I was wondering if
> you
> ended up making any progress on this ? and what you ended up doing
> I've benchmarked my drive arrays at up to 240 GB/sec each and I consistently
> move only about 60 - 80 MB of data through samba. At the same time I'm able
> to conduct NFS transfers to clinets up to around 80 MB /sec but samba always
> stay's around 60ish.
>
> I used to get double the performance running a dual 3 ghz XEON on an SGI
> redhat9 2.4 kernel with drives that would benchmark half as fast.
>
> What am I missing ?
>
>
>
>
> Server
> Quad intel nic e1000
> fc3 ( admittedly an older kernel but shouldn't matter to much)2.6.9
> Opteron 246 on tyan mobo
> Qlogic 2342 controller
> 2 fibre chassis/Areca controllers/RAID6/ 16 x SATA RAID
> XFS fs
>
> Workstations
> W2K
> service pack 4
>
>
> Switches
> 1 x Foundry layer 3 fastiron
> 3 x Foundry layer 2 edgeiron
>
>
>
>
> ----- Original Message -----
> From: "Alexander Lazarevich" <alazarev at itg.uiuc.edu>
> To: <samba at lists.samba.org>
> Sent: Friday, February 25, 2005 4:42 PM
> Subject: RE: [Samba] samba 3 performance
>
>
>> Marc,
>>
>> Thanks for the feedback. I've got a dual 64-bit opteron system (246),
>> going to run FC3, and I'll try to get 75+MB/sec from samba 3 <-> windows
>> xp client. I'll let you know the results.
>>
>> Alex
>>
>> On Fri, 25 Feb 2005, Kaplan, Marc wrote:
>>
>>> Yes, I get more than 30MB/s performance. The benchmark I use (NetBench)
>>> is essentially CPU bound, such that a faster processor = faster
>>> performance. With a very fast hardware config (dual 3.2GHz processors),
>>> I've been able to hit around 100MB/s. Changing the RAM or other
>>> attributes does not buy me much, it seems that processor power is the
>>> bottleneck (at least in my case).
>>>
>>> When doing your speed test, monitor the CPU utilization for smbd, and
>>> see if it's at 100% of your linux server.
>>>
>>> -Marc
>>>
>>>> -----Original Message-----
>>>> From: samba-bounces+marc_kaplan=adaptec.com at lists.samba.org
>>> [mailto:samba-
>>>> bounces+marc_kaplan=adaptec.com at lists.samba.org] On Behalf Of
>>> Alexander
>>>> Lazarevich
>>>> Sent: Thursday, February 24, 2005 11:36 AM
>>>> To: samba at lists.samba.org
>>>> Subject: [Samba] samba 3 performance
>>>>
>>>> Does anyone succesfully get more than 60MB/sec sequential throughput,
>>>> WITHOUT jumbo frames, with the following configuration:
>>>>
>>>> samba 3 on RedHat linux server
>>>> windows XP Pro workstations
>>>> GigE NIC's and GigE switches
>>>>
>>>> Assuming all the disks/buses on the server and client ends are capable
>>> of
>>>> those speeds. We have that exact setup, and we only get 30MB/sec
>>> maximum
>>>> sequential throughput. In fact our servers and clients disk benchmark
>>> at
>>>> more than 100MB/sec seq. throughput, and our netperf is >100MB/sec as
>>>> well, but we still only get 30MB/sec when going through samba.
>>>>
>>>> Also, we actually do not manage our network switches, and we are told
>>> the
>>>> switches do not support jumbo frames, so changing the MTU on the
>>> client
>>>> NIC's and samba get's us nowhere because the switches won't do it
>>> anyway.
>>>>
>>>> Mostly I'm just trying to find out if anyone get's decent GigE network
>>>> throughput through samba 3. I want to rule out that samba is the
>>>> bottleneck.
>>>>
>>>> Thanks,
>>>>
>>>> Alex
>>>>
>>>>
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>