On Jan 17, 2013, at 8:03 AM, John Baldwin wrote:

> On Thursday, January 17, 2013 10:57:01 am Devin Teske wrote:
>> On Jan 17, 2013, at 4:06 AM, Ali Okan YÜKSEL wrote:
>> 
>>> I know for UPDATING, it s not correct way, but i tried and 8.2 system 
> works
>>> with 8.3 kernel (copied 8.3 /boot/kernel directory to freebsd 8.2
>>> /boot/kernel) and it s not good solution but i want to know;
>>> 
>>> 
>>>  - What are specific disadvantages that i can see clearly, running 8.3
>>>  kernel on freebsd 8.2?
>> 
>> A couple user land tools might barf on you (listed below).
>> 
>> Other than that, it's generally considered very safe.
>> 
>> The quintessential test-case is running an 8.2 jail under an 8.3 host.
>> 
>> We do this all the time with various releases (again, most-problematic 
> utilities listed below).
>> 
>> 
>> 
>>>  - What are user land tools those not match with 8.3 kernel on freebsd
>>>  8.2 system…?
>>> 
>> 
>> top and ps might complain about procsize mismatch.
>> 
>> netstat has been known to have problems if the gap is too wide.
> 
> These generally do not have problems in recent release branches.  top and ps 
> haven't complained about procsize since the 4.x days as 5.0 introduced a new 
> kinfo_proc structure that the kernel exports and it hasn't changed in size 
> since 5.0.
> 
> The mfiutil issue dhw@ mentioned is real and is due to an mfi(4) driver 
> change.  I merged a fix for the panics to 8-stable, but it just makes
> old mfiutil binaries not work at all.
> 

You're the perfect person to help us figure out why when we:

1. back-port mfi(4) from stable/8 into releng/8.3 (8.3-RELEASE-p5 at the time 
of back-port)

2. Succeed in getting 8.3 to boot on Thunderbolt card

3. mfiutil produces Inappropriate ioctl for device

Even after…

4. Recompiling mfiutil from stable/8 (albeit in a releng/8.3 build environment 
-- back ported headers applied for new macros even)

Any hints on where to go next to restore mfiutil access?
-- 
Devin

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