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SubjectRe: libata - anomaly performance with NCQ
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On Sat, Jan 31, 2009 at 6:18 AM, Robert Hancock <hancockrwd@gmail.com> wrote:

> bonnie++ is one I've used, I'm sure there are others.. Of course, what do
> you compare the results to..

Hmmm more tests == more confusions ;-)

NCQ ENABLED:

Version 1.03b ------Sequential Output------ --Sequential Input- --Random-
-Per Chr- --Block-- -Rewrite- -Per Chr- --Block-- --Seeks--
Machine Size K/sec %CP K/sec %CP K/sec %CP K/sec %CP K/sec %CP /sec %CP
banan 6G 32681 99 81220 35 37915 31 32675 99 88157 28 286.0 0
------Sequential Create------ --------Random Create--------
-Create-- --Read--- -Delete-- -Create-- --Read--- -Delete--
files /sec %CP /sec %CP /sec %CP /sec %CP /sec %CP /sec %CP
16 3115 32 +++++ +++ 3774 38 3321 38 +++++ +++ 1004 10

NCQ DISABLED:
Version 1.03b ------Sequential Output------ --Sequential Input- --Random-
-Per Chr- --Block-- -Rewrite- -Per Chr- --Block-- --Seeks--
Machine Size K/sec %CP K/sec %CP K/sec %CP K/sec %CP K/sec %CP /sec %CP
banan 6G 32617 99 84305 36 36022 16 32889 99 88199 28 233.9 0
------Sequential Create------ --------Random Create--------
-Create-- --Read--- -Delete-- -Create-- --Read--- -Delete--
files /sec %CP /sec %CP /sec %CP /sec %CP /sec %CP /sec %CP
16 3866 40 +++++ +++ 5538 48 3668 38 +++++ +++ 1093 11


So it looks very similar but without ncq looks a bit better, doesn't it?

something practical test: copy a movie file (~750MB) into /tmp (tmpfs):
ncq: ~70-75MB/s
noncq: ~65-70MB/s

and hdparm once again:

ncq:
Timing buffered disk reads: 108 MB in 3.06 seconds = 35.33 MB/sec
noncq:
Timing buffered disk reads: 258 MB in 3.01 seconds = 85.63 MB/sec


Can you or anyone else analyze those results? They confuse me a lot
cause they are sometimes in a conflict.
And what results of bonnie++ should i compare to other tests?
sequintal output:block ? or per?

and here is my hdd:
Model=ST9320421AS , FwRev=SD13 ,
SerialNo= 5TJ0DGSP
Config={ HardSect NotMFM HdSw>15uSec Fixed DTR>10Mbs RotSpdTol>.5% }
RawCHS=16383/16/63, TrkSize=0, SectSize=0, ECCbytes=4
BuffType=unknown, BuffSize=16384kB, MaxMultSect=16, MultSect=?16?
CurCHS=16383/16/63, CurSects=16514064, LBA=yes, LBAsects=625142448
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 *udma6
AdvancedPM=yes: unknown setting WriteCache=enabled
Drive conforms to: unknown: ATA/ATAPI-4,5,6,7


regards,
bart


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