Date: Sat, 28 Jun 2008 13:30:39 -0700 From: Rudy <crapsh@monkeybrains.net> To: Jack Vogel <jfvogel@gmail.com> Cc: freebsd-net@freebsd.org Subject: Re: Seeking help understanding my "emX: watchdog timeout" messages Message-ID: <48669F6F.1050005@monkeybrains.net> In-Reply-To: <485ECF20.6000607@monkeybrains.net> References: <20080516185813.H866@logos.sky.od.ua> <2a41acea0805160904g7dcf9f58rf69ca5d0612945cc@mail.gmail.com> <4853055C.2030303@MonkeyBrains.NET> <48535A11.4020003@monkeybrains.net> <48582C29.8030307@monkeybrains.net> <2a41acea0806191055w5e112b8bsa57a8db2b177adbe@mail.gmail.com> <485C0F07.7000408@monkeybrains.net> <2a41acea0806201355y3b123462wc37280f28a9f4216@mail.gmail.com> <485C41C5.4090706@monkeybrains.net> <2a41acea0806201713m7a083b9dr10894c8a0845df8e@mail.gmail.com> <485D5B9E.8020908@monkeybrains.net> <485ECF20.6000607@monkeybrains.net>
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Continuing the emX thread...
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#man 4 em
hw.em.txd
Number of transmit descriptors allocated by the driver. The
default value is 256. The 82542 and 82543-based adapters can
handle up to 256 descriptors, while others can have up to 4096.
I just upped values in my loader.conf:
hw.em.rxd=1024
hw.em.txd=1024
Thanks Dmitriy -- your reply on jboss gave me idea to try tuning that value.
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I tried upping the rx_processing_limit on my active interfaces and that caused MORE watchdog
timeout events. In fact, they started to happen on em0 and em1 (previously not throwing errors).
dev.em.0.rx_processing_limit=200
dev.em.1.rx_processing_limit=200
dev.em.2.rx_processing_limit=200
dev.em.4.rx_processing_limit=200
I am going to keep those values in with the new hw.em.rxd settings and back them out if watchdog
events persist.
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Questions to EM users:
Do you use POLLING or MSI Interrupts with FreeBSD 7.x and PCIe Ethernet adapters?
Do you see watchdog timeout events on your Intel adapters?
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I emailed Intel and asked for help. They referred me to this document (not very helpful):
http://downloadmirror.intel.com/10957/ENG/README.txt
I replied and asked if other users are reporting watchdog timeout events. The tech was less than
helpful -- here was the response from adaptersuppor@mailbox.cps.intel.com:
>> Please be aware that you are the first person who reports those “watchdog timeouts”.
>>
>> Please note that this is an intermittent behavior, we have not been able to
>> determine exactly when that issue happens, and to which exact adapter under
>> which exact circumstances, in the moment that we have a problem we are able
>> to recreate many times this will become a “known issue” and most certainly
>> it will be posted in our website under the adapters that has that issue.
Dude! Take an ESL class. I also CC'd freebsdnic@mailbox.intel.com.
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Last week I tried changing this setting:
> dev.em.2.tx_int_delay: 33
> dev.em.2.tx_abs_int_delay: 33
They did not help.
Rudy
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