[2.6.4] IDE performance drop again

[Pawel Dziekonski]

hi,

after switching from 2.6.1 to 2.6.4 I see IDE performance drop again.

hdparm /dev/hda

/dev/hda:
 multcount    =  1 (on)
 IO_support   =  1 (32-bit)
 unmaskirq    =  1 (on)
 using_dma    =  1 (on)
 keepsettings =  0 (off)
 readonly     =  0 (off)
 readahead    = 8192 (on)
 geometry     = 26310/16/63, sectors = 26520480, start = 0

under 2.4.x and 2.6.1 i had about 40 MB/s in hdparm -ft. in 2.6.4 i get
at most 26 MB/s. changing readahead does not help. i'm using ac
scheduler.

lspci

00:00.0 Host bridge: VIA Technologies, Inc. VT8363/8365 [KT133/KM133] (rev 02)
00:01.0 PCI bridge: VIA Technologies, Inc. VT8363/8365 [KT133/KM133 AGP]
00:07.0 ISA bridge: VIA Technologies, Inc. VT82C686 [Apollo Super South] (rev 22)
00:07.1 IDE interface: VIA Technologies, Inc.  VT82C586A/B/VT82C686/A/B/VT8233/A/C/VT8235 PIPC Bus Master IDE (rev 10)
00:07.2 USB Controller: VIA Technologies, Inc. USB (rev 10)
00:07.3 USB Controller: VIA Technologies, Inc. USB (rev 10)
00:07.4 Bridge: VIA Technologies, Inc. VT82C686 [Apollo Super ACPI] (rev 30)
00:07.5 Multimedia audio controller: VIA Technologies, Inc. VT82C686 AC97 Audio Controller (rev 20)
00:0b.0 SCSI storage controller: Tekram Technology Co.,Ltd. TRM-S1040 (rev 01)
00:11.0 Multimedia video controller: Brooktree Corporation Bt878 Video Capture (rev 02)
00:11.1 Multimedia controller: Brooktree Corporation Bt878 Audio Capture (rev 02)
00:14.0 Ethernet controller: Realtek Semiconductor Co., Ltd.  RTL-8139/8139C/8139C+ (rev 10)
01:00.0 VGA compatible controller: nVidia Corporation NV11 [GeForce2 MX/MX 400] (rev b2)

/proc/interrupts 
           CPU0       
  0:    1602384          XT-PIC  timer
  1:       4247          XT-PIC  i8042
  2:          0          XT-PIC  cascade
  8:       6328          XT-PIC  rtc
  9:          0          XT-PIC  acpi
 10:     194179          XT-PIC  uhci_hcd, uhci_hcd, eth0
 11:          0          XT-PIC  VIA686A
 12:     100786          XT-PIC  nvidia, bttv0
 14:      27087          XT-PIC  ide0
 15:          5          XT-PIC  ide1
NMI:          0 
LOC:    1598373 
ERR:     260588
MIS:          0

regards, P

PS. I'm not subscribed, so please CC me your replies. thanks.
-- 
Pawel Dziekonski <pawel.dziekonski|@|pwr.wroc.pl>, KDM WCSS avatar:0:0:
Wroclaw Networking & Supercomputing Center, HPC Department
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