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Date: Thu, 20 May 2010 19:19:47 +0700
From: Eugene Grosbein <eugen@grosbein.pp.ru>
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Cc: freebsd-net@freebsd.org
Subject: Re: increasing em(4) buffer sizes
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On 20.05.2010 13:06, rihad wrote:

>>>> Some more useful tunnables for loader.conf:
>>>>
>>>> dev.em.0.rx_int_delay=200
>>>> dev.em.0.tx_int_delay=200
>>>> dev.em.0.rx_abs_int_delay=200
>>>> dev.em.0.tx_abs_int_delay=200
>>>> dev.em.0.rx_processing_limit=-1
>>>>
>>> So this interrupt delay is the much talked about interrupt moderation?
>>> Thanks, I'll try them. Is there any risk the machine won't boot with
>>> them if rebooted remotely?
>>
>> Yes, for hw.em.rxd/hw.em.txd only. em interfaces will not function
>> if you set these two too high for your nic chip, so read man em
>> and mentioned Intel document carefully.
>>
>> It's pretty safe to play with other tunnables.
>>
> Can I even set the mentioned dev.em.0.* settings on a live system 
> remotely? You seem to also have an em card, have you tried doing that? 

Yes, it is permitted.