________________________________________________________________________ > From: Jim Cornette <fc-cornette@xxxxxxxxxxxxx> > To: For users of Fedora Core releases <fedora-list@xxxxxxxxxx> > Subject: Re: High CPU - kjournald & kblockd - nice level > Date: Tue, 22 Jun 2004 17:39:25 -0400 > > Brian Hanks wrote: > > >Has anyone else experienced what I will call sporadic, jerky X response > >in FC2? It seems that any time I have a background process running that > >is even remotely utilizing any CPU or IO, I have pathetic response in > >X. > > > >My RH9 box and my FC1 box don't have this issue and they are slower > >machines with less memory and older disk. As a test to rule out CPU or > >chipset specific issues, I've built a completely different machine with > >FC2. Both machines exhibited the exact same behavior. > > > >I quite reluctant to make the switch to FC2 without solving this issue. > >It's quite annoying to have X become unstable every time I go to compile > >something in the background. > > > >Hardware Setup #1: > >Asus A7V600 (VIA Chipset) > >1 GB RAM > >Athlon XP 3000+ > >2 Samsung 120 GB SATA drives (RAID1 with LVM2) > >NVIDIA MX440 > >FC2 fully updated > > > >Hardware Setup #2: > >Asus A7N266-VM (NVidia Chipset) > >1 GB RAM > >Athlon XP 2100+ > >2 Maxtor 40 GB ATA drives (RAID1 with LVM2) > >NVIDIA MX400 > >FC2 fully updated > > > >Upon further digging, it looks like kblockd & kjournald > >are chewing up a ton of CPU. I'm even noticing it when I don't have > >large processes running. It's definitely not as severe, but it seems to > >be occurring quite regularly. > > > >The one test that I haven't done is to remove LVM2 and RAID1 from the > >picture. I wonder if that would eliminate the problem? > > > >What exactly is the function of kblockd and kjournald? Any insight > >would be greatly appreciated. > > > >Thanks, > >Brian Hanks > >bhanks@xxxxxxxxxx > > > > > > > I'm not doing a lot of compiling on my computer. I recall something > about the scheduler having priority levels that can be assigned to have > processes use a lower or higher priority level. > > I just tried to run > man nice > and it came up with an explanation. > > My question about the completion of the compilation. Is the speed of the > compilation quicker? > > Jim > It is quicker than my other machines, but not by much; and since it is a newer, faster machine I expect it to be a bit quicker. The other weird thing is that it also happens when I'm doing files transfers. If I copy a file from one file system to another or if I scp a file to the machine, the same thing happens. -Brian
