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Date: Fri, 13 May 2011 09:27:17 -0500 From: Eric Sandeen <sandeen@...hat.com> To: Rogier Wolff <R.E.Wolff@...Wizard.nl> CC: linux-ext4@...r.kernel.org Subject: Re: Slow filesystem. On 5/13/11 7:59 AM, Rogier Wolff wrote: > > Hi > > My work (as in what brings in money to buy things from) file-system is > now "slow as hell". Last time this happened you guys told me that this > was because I had millions of hardlinks and way too many files. > > Filesystem Inodes IUsed IFree IUse% Mounted on > /dev/md0 815M 4.1M 811M 1% /recover2 > > I have only 4.1M files. Only 1% inodes "in use". > > > The filesystem was filling up lately, but i've managed to create some > free space. > > Filesystem Size Used Avail Use% Mounted on > /dev/md0 6.3T 5.3T 720G 89% /recover2 > > The question is: How do I get the filesystem to perform > normally again? > > > All mkdir calls are taking around 62 milliseconds: > > 14:57:02 mkdir("...ME_25c8e/", 0777) = 0 <0.062312> > 14:57:02 mkdir("...ME_112ff/", 0777) = 0 <0.062658> > 14:57:02 mkdir("...ME_183cf/", 0777) = 0 <0.062344> I don't know what the workload is, and "slow" isn't very well characterized here, but from this can I assume that mkdir is the bottleneck? Did you ever try that patch I sent you for this issue in March? Using oprofile to see where the fs is spending its time might also be useful. -Eric > while on my workstation where i'm not supposed to be working > with client-data I get: > > 14:58:18 mkdir("...ME_2a6c6/", 0777) = 0 <0.000033> > 14:58:18 mkdir("...ME_2b3d9/", 0777) = 0 <0.000031> > 14:58:18 mkdir("...ME_2c63f/", 0777) = 0 <0.000034> > > So, things on my big datastorage drive are about 2000 times slower > than on my workstation. > > Roger. > -- To unsubscribe from this list: send the line "unsubscribe linux-ext4" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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