Re: [gentoo-user] Very bad system response

["Hemmann, Volker Armin" <volker.armin.hemmann@tu-clausthal.de>]

On Mittwoch, 7. Februar 2007, Norberto Bensa wrote:
> Hemmann, Volker Armin wrote:
> > On Dienstag, 6. Februar 2007, Michael Schreckenbauer wrote:
> > > I don't think, swap is the cause of this. This system has 1,5GB Ram,
> > > swap is nearly never touched :)
> >
> > swap was only an example. Things that kill performance: big tar, big copy
> > around, and everything that touches a lot of files....
>
> Check your DMA settings
>

my DMA settings are ok. Really, really.
hdparm /dev/hda

/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     = 16383/255/63, sectors = 234493056, start = 0

[   36.419597] hda: 234493056 sectors (120060 MB) w/8192KiB Cache, 
CHS=16383/255/63, UDMA(100)

and

[   37.500706] ahci 0000:03:00.0: AHCI 0001.0000 32 slots 1 ports 3 Gbps 0x1 
impl SATA mode
[   37.501239] ahci 0000:03:00.0: flags: 64bit ncq pm led clo pmp pio slum 
part
[   37.501632] ata1: SATA max UDMA/133 cmd 0xFFFFC20000004100 ctl 0x0 bmdma 
0x0 irq 35
[   37.502167] scsi0 : ahci
[   37.987972] ata1: SATA link up 3.0 Gbps (SStatus 123 SControl 300)
[   37.988743] ata1.00: ATA-7, max UDMA/133, 312581808 sectors: LBA48
[   37.989026] ata1.00: ata1: dev 0 multi count 16
[   37.989838] ata1.00: configured for UDMA/133
[   37.990176] scsi 0:0:0:0: Direct-Access     ATA      WDC WD1600JS-00M 10.0 
PQ: 0 ANSI: 5
[   37.990773] SCSI device sda: 312581808 512-byte hdwr sectors (160042 MB)
[   37.991061] sda: Write Protect is off
[   37.991339] sda: Mode Sense: 00 3a 00 00
[   37.991349] SCSI device sda: drive cache: write back
[   37.991657] SCSI device sda: 312581808 512-byte hdwr sectors (160042 MB)
[   37.991942] sda: Write Protect is off
[   37.992225] sda: Mode Sense: 00 3a 00 00
[   37.992235] SCSI device sda: drive cache: write back
[   37.992514]  sda: sda1 sda2 sda3 sda4 < sda5 sda6 >
[   38.033040] sd 0:0:0:0: Attached scsi disk sda

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