Date: Thu, 17 Jan 2013 11:03:40 -0500 From: John Baldwin <jhb@freebsd.org> To: freebsd-hackers@freebsd.org, Devin Teske <dteske@freebsd.org> Cc: Ali Okan =?windows-1252?q?Y=DCKSEL?= <kaox.gen@gmail.com> Subject: Re: disadvantages of running 8.3 kernel on freebsd 8.2 system Message-ID: <201301171103.41013.jhb@freebsd.org> In-Reply-To: <9A20C472-593A-4AAB-A0C0-FE6375011DAD@fisglobal.com> References: <CANiJOX3Q7e1q7=4yvF6Hy%2BLRGZMqpyVrim7nxefeQViO86CvgQ@mail.gmail.com> <9A20C472-593A-4AAB-A0C0-FE6375011DAD@fisglobal.com>
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On Thursday, January 17, 2013 10:57:01 am Devin Teske wrote: > On Jan 17, 2013, at 4:06 AM, Ali Okan Y=DCKSEL wrote: >=20 > > I know for UPDATING, it s not correct way, but i tried and 8.2 system=20 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; > >=20 > >=20 > > - What are specific disadvantages that i can see clearly, running 8.3 > > kernel on freebsd 8.2? >=20 > A couple user land tools might barf on you (listed below). >=20 > Other than that, it's generally considered very safe. >=20 > The quintessential test-case is running an 8.2 jail under an 8.3 host. >=20 > We do this all the time with various releases (again, most-problematic=20 utilities listed below). >=20 >=20 >=20 > > - What are user land tools those not match with 8.3 kernel on freebsd > > 8.2 system=85? > >=20 >=20 > top and ps might complain about procsize mismatch. >=20 > 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 p= s=20 haven't complained about procsize since the 4.x days as 5.0 introduced a ne= w=20 kinfo_proc structure that the kernel exports and it hasn't changed in size= =20 since 5.0. The mfiutil issue dhw@ mentioned is real and is due to an mfi(4) driver=20 change. I merged a fix for the panics to 8-stable, but it just makes old mfiutil binaries not work at all. =2D-=20 John Baldwin
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