Messages in this thread | | | Date | Tue, 02 Dec 2003 15:34:12 +0000 | From | shal <> | Subject | via82cxxx, DMA and performance problem |
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Hello,
I have a MSI KT3 Ultra2 mother card with the VT82C586 IDE interface.
I have a question about IDE performance.
On the 2.6.0-test10-mm1, I have this : # lsmod Module Size Used by eagle_usb 113280 0
# hdparm /dev/hda /dev/hda: multcount = 16 (on) IO_support = 0 (default 16-bit) unmaskirq = 0 (off) using_dma = 0 (off) keepsettings = 0 (off) readonly = 0 (off) readahead = 256 (on) geometry = 65535/16/63, sectors = 78177792, start = 0
# hdparm -tT /dev/hda /dev/hda: Timing buffer-cache reads: 920 MB in 2.01 seconds = 458.24 MB/sec Timing buffered disk reads: 22 MB in 3.05 seconds = 7.21 MB/sec
I do : # modprobe via82cxxx
Now I have:
# hdparm -tT /dev/hda /dev/hda: Timing buffer-cache reads: 744 MB in 2.00 seconds = 371.87 MB/sec Timing buffered disk reads: 20 MB in 3.06 seconds = 6.54 MB/sec
I active DMA: # hdparm -d 1 /dev/hda /dev/hda: setting using_dma to 1 (on) using_dma = 1 (on)
And do a sync , the sync take one minute !!!! When I active DMA, during one minute the disk freeze (sync or other program)!!
After the freeze, this work but no amelioration : # hdparm -tT /dev/hda /dev/hda: Timing buffer-cache reads: 940 MB in 2.01 seconds = 467.97 MB/sec Timing buffered disk reads: 20 MB in 3.05 seconds = 6.56 MB/sec
kernel message: VP_IDE: IDE controller at PCI slot 0000:00:11.1 ACPI: No IRQ known for interrupt pin A of device 0000:00:11.1 - using IRQ 255 VP_IDE: chipset revision 6 VP_IDE: not 100% native mode: will probe irqs later ide: Assuming 33MHz system bus speed for PIO modes; override with idebus=xx VP_IDE: VIA vt8235 (rev 00) IDE UDMA133 controller on pci0000:00:11.1 ide0: BM-DMA at 0xfc00-0xfc07, BIOS settings: hda:DMA, hdb:DMA ide1: BM-DMA at 0xfc08-0xfc0f, BIOS settings: hdc:DMA, hdd:pio ide0: I/O resource 0x3F6-0x3F6 not free. hda: ERROR, PORTS ALREADY IN USE hdb: ERROR, PORTS ALREADY IN USE register_blkdev: cannot get major 3 for ide0 ide1: I/O resource 0x376-0x376 not free. hdc: ERROR, PORTS ALREADY IN USE register_blkdev: cannot get major 22 for ide1 Module via82cxxx cannot be unloaded due to unsafe usage in include/linux/module.h:483 blk: queue cf5cabf8, I/O limit 4095Mb (mask 0xffffffff) hda: dma_timer_expiry: dma status == 0x61 hda: DMA timeout error hda: dma timeout error: status=0x58 { DriveReady SeekComplete DataRequest }
Information :
# lspci 00:00.0 Host bridge: VIA Technologies, Inc. VT8366/A/7 [Apollo KT266/A/333] 00:01.0 PCI bridge: VIA Technologies, Inc. VT8366/A/7 [Apollo KT266/A/333 AGP] 00:05.0 Multimedia video controller: Brooktree Corporation Bt878 Video Capture (rev 11) 00:05.1 Multimedia controller: Brooktree Corporation Bt878 Audio Capture (rev 11) 00:06.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL-8139/8139C/8139C+ (rev 10) 00:07.0 SCSI storage controller: LSI Logic / Symbios Logic 53c810 (rev 23) 00:08.0 Multimedia audio controller: Ensoniq 5880 AudioPCI (rev 02) 00:0a.0 VGA compatible controller: 3Dfx Interactive, Inc. Voodoo Banshee (rev 03) 00:10.0 USB Controller: VIA Technologies, Inc. USB (rev 80) 00:10.3 USB Controller: VIA Technologies, Inc. USB 2.0 (rev 82) 00:11.0 ISA bridge: VIA Technologies, Inc. VT8235 ISA Bridge 00:11.1 IDE interface: VIA Technologies, Inc. VT82C586/B/686A/B PIPC Bus Master IDE (rev 06)
ide: Assuming 33MHz system bus speed for PIO modes; override with idebus=xx hda: MAXTOR 6L040J2, ATA DISK drive hdb: Maxtor 83240D3, ATA DISK drive hdc: CRD-8322B, ATAPI CD/DVD-ROM drive ide0 at 0x1f0-0x1f7,0x3f6 on irq 14 ide1 at 0x170-0x177,0x376 on irq 15 hda: max request size: 128KiB hda: 78177792 sectors (40027 MB) w/1819KiB Cache, CHS=65535/16/63 hda: hda1 hda2 < hda5 hda6 hda7 hda8 > hda3 hdb: max request size: 128KiB hdb: 6329388 sectors (3240 MB) w/256KiB Cache, CHS=6697/15/63 hdb: hdb1 hdb2 hdc: ATAPI 32X CD-ROM drive, 128kB Cache Uniform CD-ROM driver Revision: 3.12
Another with the small hard drive (4G only):
# hdparm -tT /dev/hdb /dev/hdb: Timing buffer-cache reads: 968 MB in 2.00 seconds = 483.83 MB/sec Timing buffered disk reads: 20 MB in 3.11 seconds = 6.43 MB/sec
root@shal:~# hdparm -d 1 /dev/hdb /dev/hdb: setting using_dma to 1 (on) using_dma = 1 (on)
root@shal:~# hdparm -tT /dev/hdb /dev/hdb: Timing buffer-cache reads: 968 MB in 2.00 seconds = 483.35 MB/sec Timing buffered disk reads: 34 MB in 3.09 seconds = 11.00 MB/sec
The small hard drive is more speed than the big hard drive !!
On a normal Linux 2.4 (non ac tree) I can't use the via82cxxx without problem (DMA interrupt lost during boot). If the Alan Cox kernel (2.4.22-ac4) it work fine. Performance are 2MBit/sec without module and 6MBit/sec with module.
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