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DateSun, 29 Feb 2004 02:35:12 -0800
FromMike Fedyk <>
SubjectRe: 2.6.x: iowait problem while burning a CD
Paolo Ornati wrote:
> On Saturday 28 February 2004 15:52, Alex Bennee wrote:
> 
>>>>At that point, mkisofs is probably running into a bazillion
>>>>small files, in subdirectories all over the place.
>>>>
>>>>Because a disk seek + track read takes 10ms, it's simply not
>>>>possible to read more than maybe 100 of these small files a
>>>>second, so mkisofs can't keep up.
>>>
>>>No... mkfs is reading only ONE big file ( ~ 700 MB )!
>>>
>>>And my system shouldn't be so slow:
>>>
>>>CPU: AMD Duron 750
>>>RAM: 128 MB PC100
>>>HD: 7200 RPM udma 4
>>>File System: ResiserFS
>>
>>Could this be related to your low(ish) physical memory and the need swap
>>stuff in and out? Maybe you could look at the vmstat output as you run
>>the two cases?
> 
> 
> No... swap is never touched !
> 
> But I think to have found where the problem is:
> 
> if I only create an ISO image of 672.4 MB I must wait more then 5 minutes... 
> this means about 2.2 MB/s !

How full is your filesystem on average?  If it has been around 90% or 
more, you might be having trouble with fragmentation.
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