Messages in this thread | | | From | Paolo Ornati <> | Subject | Re: 2.6.x: iowait problem while burning a CD | Date | Sun, 29 Feb 2004 10:27:34 +0100 |
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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 !
If I write a CD at 16x (~2400 KB/s) how can the image creation process be to the step with the writing one?
OK, if I create an ISO image I must (read from)/(write to) the disk, while burning on-the-fly requires only "read from disk".... But what happens if I write at 24x / 32x / 40x ???
Is 2,2 MB/s one acceptable speed?
My HD:
/dev/hda:
multcount = 16 (on) IO_support = 1 (32-bit) unmaskirq = 1 (on) using_dma = 1 (on) keepsettings = 0 (off) readonly = 0 (off) readahead = 256 (on) geometry = 38792/16/63, sectors = 39102336, start = 0
/dev/hda:
Model=WDC WD200BB-53AUA1, FwRev=18.20D18, SerialNo=WD-WMA6Y1501425 Config={ HardSect NotMFM HdSw>15uSec SpinMotCtl Fixed DTR>5Mbs FmtGapReq } RawCHS=16383/16/63, TrkSize=57600, SectSize=600, ECCbytes=40 BuffType=DualPortCache, BuffSize=2048kB, MaxMultSect=16, MultSect=16 CurCHS=16383/16/63, CurSects=16514064, LBA=yes, LBAsects=39102336 IORDY=on/off, tPIO={min:120,w/IORDY:120}, tDMA={min:120,rec:120} PIO modes: pio0 pio1 pio2 pio3 pio4 DMA modes: mdma0 mdma1 mdma2 UDMA modes: udma0 udma1 udma2 udma3 *udma4 udma5 AdvancedPM=no WriteCache=enabled Drive conforms to: device does not report version: 1 2 3 4 5
FILE SYSTEM: ReiserFS
I have also noticed that raising the writing speed (24x/32x) I have the same problems with the buffer also having created the ISO image!
Bye
-- Paolo Ornati Linux v2.6.3
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