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Message-Id: <200611241510.11526.fink@mpe.mpg.de> Date: Fri, 24 Nov 2006 15:10:11 +0100 From: "Martin A. Fink" <fink@....mpg.de> To: linux-kernel@...r.kernel.org Subject: Re: SATA Performance with Intel ICH6 Am Freitag, 24. November 2006 14:33 schrieben Sie: > On Fri, 24 Nov 2006 14:07:01 +0100 > > "Martin A. Fink" <fink@....mpg.de> wrote: > > If I understand the design of this chipset correctly, then I would have > > expected, that the CPU needs to do only few work, instead I found out, > > that writing to disk seems to be really hard work for the CPU. > > It has some work to do - the amount in question depends upon the file > system and device drivers in use. For very high throughput read up on > the O_DIRECT feature. Well this seems to be independend from the file system. I tried to write directly to the raw device, but nevertheless the cpu time was 20% (sys time). > > > My final aim is to get around 140MB/s of data from 3 different Gigabit > > Ethernet cards and store it on 3 harddisk drives that perform 50MB/s. > > > > >From the SATA bus side there should be no problem. Each of the 4 SATAs > > > on > > > > this ICH6 chipset are capable of 150MB/s. > > I doubt an ICH6 has the total memory bandwidth to achieve that to be > honest, but with PCI-E maybe you can. This is an interessting point. The specification say that I can handle around 120 to 150 MB/s each of the 4 S-ATA ports. With ICH6 the S-ATA ports seem to be directly connected to the Southbridge, and the Southbridge is directly connected to Northbridge via PCI Express. So it should be possible to get 150 MB/s from north to south and from there in packages of 55 MB/s to the disks ?! > > > So what makes my CPU that slow? Is it a hardware problem or a problem of > > SATA driver of my operating system? > > You don't give anything like enough information to even guess this. What > controller, what disks, what driver, what kernel version ? I use a Pentium 4 processor (Xeon), Intel ICH6 chipset, to write on a 250 GB S-ATA disk directly connected to one of the 4 onboard S-ATA connections. kernel version is Linux version 2.6.8-24.25-smp. As disks I used ones from Winchester as well as Maxtor. Both behave the same. Here is some information from /var/log/boot.msg <6>ACPI: RSDP (v000 DELL ) @ 0x000feb90 <6>ACPI: RSDT (v001 DELL WS 360 0x00000007 ASL 0x00000061) @ 0x000fd165 <6>ACPI: FADT (v001 DELL WS 360 0x00000007 ASL 0x00000061) @ 0x000fd19d <6>ACPI: SSDT (v001 DELL st_ex 0x00001000 MSFT 0x0100000d) @ 0xfffc8f10 <6>ACPI: MADT (v001 DELL WS 360 0x00000007 ASL 0x00000061) @ 0x000fd211 <6>ACPI: BOOT (v001 DELL WS 360 0x00000007 ASL 0x00000061) @ 0x000fd27d <6>ACPI: ASF! (v016 DELL WS 360 0x00000007 ASL 0x00000061) @ 0x000fd2a5 <6>ACPI: DSDT (v001 DELL dt_ex 0x00001000 MSFT 0x0100000d) @ 0x00000000 <6>ACPI: PM-Timer IO Port: 0x808 <7>ACPI: Local APIC address 0xfee00000 <6>ACPI: LAPIC (acpi_id[0x01] lapic_id[0x00] enabled) <4>Processor #0 15:2 APIC version 20 <6>ACPI: LAPIC (acpi_id[0x02] lapic_id[0x01] disabled) <6>ACPI: LAPIC (acpi_id[0x03] lapic_id[0x01] disabled) <6>ACPI: LAPIC (acpi_id[0x04] lapic_id[0x03] disabled) <6>ACPI: IOAPIC (id[0x01] address[0xfec00000] gsi_base[0]) <4>IOAPIC[0]: apic_id 1, version 32, address 0xfec00000, GSI 0-23 <6>ACPI: INT_SRC_OVR (bus 0 bus_irq 0 global_irq 2 dfl dfl) <6>ACPI: INT_SRC_OVR (bus 0 bus_irq 9 global_irq 9 high level) <7>ACPI: IRQ0 used by override. <7>ACPI: IRQ2 used by override. <7>ACPI: IRQ9 used by override. <4>Enabling APIC mode: Flat. Using 1 I/O APICs <6>Using ACPI (MADT) for SMP configuration information <6>CPU: L2 cache: 512K <6>CPU: Hyper-Threading is disabled <7>ACPI: PCI Interrupt Routing Table [\_SB_.PCI0._PRT] <7>ACPI: PCI Interrupt Routing Table [\_SB_.PCI0.PCI1._PRT] <4>ACPI: PCI Interrupt Link [LNKA] (IRQs 3 4 5 6 7 9 10 *11 12 15) <4>ACPI: PCI Interrupt Link [LNKB] (IRQs 3 4 5 6 7 9 *10 11 12 15) <4>ACPI: PCI Interrupt Link [LNKC] (IRQs 3 4 5 6 7 *9 10 11 12 15) <4>ACPI: PCI Interrupt Link [LNKD] (IRQs 3 4 5 6 7 9 *10 11 12 15) <4>ACPI: PCI Interrupt Link [LNKE] (IRQs 3 4 5 6 7 9 10 11 12 15) *0, disabled. <4>ACPI: PCI Interrupt Link [LNKF] (IRQs 3 4 *5 6 7 9 10 11 12 15) <4>ACPI: PCI Interrupt Link [LNKG] (IRQs 3 4 *5 6 7 9 10 11 12 15) <4>ACPI: PCI Interrupt Link [LNKH] (IRQs 3 4 *5 6 7 9 10 11 12 15) <6>Linux Plug and Play Support v0.97 (c) Adam Belay <6>PCI: Using ACPI for IRQ routing <6>ACPI: PCI interrupt 0000:00:1d.0[A] -> GSI 16 (level, low) -> IRQ 169 <6>ACPI: PCI interrupt 0000:00:1d.1[B] -> GSI 19 (level, low) -> IRQ 177 <6>ACPI: PCI interrupt 0000:00:1d.2[C] -> GSI 18 (level, low) -> IRQ 185 <6>ACPI: PCI interrupt 0000:00:1d.3[A] -> GSI 16 (level, low) -> IRQ 169 <6>ACPI: PCI interrupt 0000:00:1d.7[D] -> GSI 23 (level, low) -> IRQ 193 <6>ACPI: PCI interrupt 0000:00:1f.1[A] -> GSI 18 (level, low) -> IRQ 185 <6>ACPI: PCI interrupt 0000:00:1f.2[A] -> GSI 18 (level, low) -> IRQ 185 <6>ACPI: PCI interrupt 0000:00:1f.3[B] -> GSI 17 (level, low) -> IRQ 201 <6>ACPI: PCI interrupt 0000:00:1f.5[B] -> GSI 17 (level, low) -> IRQ 201 <6>ACPI: PCI interrupt 0000:01:00.0[A] -> GSI 16 (level, low) -> IRQ 169 <6>ACPI: PCI interrupt 0000:02:00.0[A] -> GSI 21 (level, low) -> IRQ 209 <6>ACPI: PCI interrupt 0000:02:01.0[A] -> GSI 22 (level, low) -> IRQ 217 <6>ACPI: PCI interrupt 0000:02:02.0[A] -> GSI 17 (level, low) -> IRQ 201 <6>ACPI: PCI interrupt 0000:02:0c.0[A] -> GSI 18 (level, low) -> IRQ 185 <6>scsi1 : ata_piix <5> Vendor: ATA Model: WDC WD740GD-75FL Rev: 21.0 <5> Type: Direct-Access ANSI SCSI revision: 05 <5>SCSI device sda: 144531250 512-byte hdwr sectors (74000 MB) <5>SCSI device sda: drive cache: write back <5>SCSI device sda: 144531250 512-byte hdwr sectors (74000 MB) <5>SCSI device sda: drive cache: write back <6> sda: sda1 sda2 < sda5 sda6 sda7 sda8 > <5>Attached scsi disk sda at scsi0, channel 0, id 0, lun 0 > > > By the way: I'm working with SuSE Linux 9.2 on a Dell Desktop PC, 1GB RAM > > For vendor kernels, especially older ones it is probably best to ask the > vendor first. > > Alan Here some measurement results: time dd if=/dev/zero of=test.zero bs=1M count=1000 results in real 0m52.561s user 0m0.003s sys 0m7.407s and strace dd... gives among other information 6.84s 1004calls syscall: write So I spend 45s of 52s within the kernel. 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