Re: ZFS/RAIDZ and SAMBA: abyssimal performance

On Jan 7, 2013, at 11:14 AM, Daniel Kalchev <daniel@digsys.bg> wrote:

> 
> On Jan 4, 2013, at 4:06 PM, Fleuriot Damien <ml@my.gd> wrote:
> 
>> 
>> And network cards:
>> # Up a bit our intel cards parameters
>> hw.em.txd=4096
>> hw.em.rxd=4096
>> hw.em.tx_int_delay=512
>> hw.em.rx_int_delay=512
>> hw.em.tx_abs_int_delay=1024
>> hw.em.rx_abs_int_delay=1024
>> 
> 
> I am curious why we need to manually set up these values. Especially the txd/rxd -- here are few controllers supported by the em driver that can't handle 4096 descriptors and the choice could really be made at driver attach time.. That could also permit different em interfaces in the system (using different chips) to have different settings.
> 
> My belief is the auto tuning should set things up for maximum performance, given the hardware and if someone really needs smaller queues they could just use the tunables. 
> 
> Are there drawbacks?
> 
> Daniel

Well perhaps the code to handle auto tuning isn't present in the driver itself.

I'm not a huge fan of the idea, I believe it would be rather taxing to implement all the exceptions and that some could easily be overlooked.

I believe it's better to have a more user-friendly documentation and let users tune the hardware to suit their needs.

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