Date: Fri, 06 Dec 2002 17:52:38 -0800 From: Kirk McKusick <mckusick@beastie.mckusick.com> To: Brooks Davis <brooks@one-eyed-alien.net> Cc: Nate Lawson <nate@root.org>, Archie Cobbs <archie@dellroad.org>, freebsd-current@FreeBSD.ORG Subject: Re: backgroud fsck is still locking up system (fwd) Message-ID: <200212070152.gB71qc59094441@beastie.mckusick.com> In-Reply-To: Your message of "Fri, 06 Dec 2002 10:44:45 PST." <20021206104445.A1950@Odin.AC.HMC.Edu>
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Adding a two minute delay before starting background fsck sounds like a very good idea to me. Please send me your suggested change. Kirk McKusick =-=-=-=-= Date: Fri, 6 Dec 2002 10:44:45 -0800 From: Brooks Davis <brooks@one-eyed-alien.net> To: Nate Lawson <nate@root.org> Cc: Kirk McKusick <mckusick@beastie.mckusick.com>, Archie Cobbs <archie@dellroad.org>, freebsd-current@FreeBSD.ORG Subject: Re: backgroud fsck is still locking up system (fwd) X-ASK-Info: Confirmed by User On Fri, Dec 06, 2002 at 10:27:10AM -0800, Nate Lawson wrote: > On Thu, 5 Dec 2002, Kirk McKusick wrote: > > Does the background fsck process continue to run, or does the whole > > system come to a halt? If the fsck process continues to run, what=20 > > happens when it eventually finishes? Is the system still dead, or=20 > > does it come back to life? If the system does not come back to life > > can you get me the output of `ps axl'? If not, can you break into > > the debugger and get a ps output? (You will need to have the DDB > > option specified in your config file). >=20 > Sorry for butting in. I think Archie is referring to bg fsck gaining an > unfair share of cpu due to it running due to IO completions. Last I > heard, we were waiting until after 5.0 to experiment with scheduler > changes to make it more fair. I have not seen any hard locks or other > problems with bg fsck after your commit. My experience is that, at least with my laptop (which has a very slow disk), bg fsck works OK, but starting applictions for the first time while fsck is running is _very_ painful. Even getty seems to have a hard time. I've found that adding a two minute delay before the fsck is sufficent to allow the system to finish starting up and for me to load X and my main applictions which lets me work while bg fsck is running. I posted a patch to add an optional delay in the rc scripts a while ago, but Kirk was going to re-enable the priority stuff soon so I didn't persue it. If there's intrest, I'll regenerate it and repost it. -- Brooks Any statement of the form "X is the one, true Y" is FALSE. PGP fingerprint 655D 519C 26A7 82E7 2529 9BF0 5D8E 8BE9 F238 1AD4 To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-current" in the body of the message
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