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Accepted
jamieb
Asked: 2010-03-14 23:02:45 +0800 CST

我的 linux 服务器需要一个多小时才能启动。建议？

  • 772

我正在构建一个 CentOS 5.4 系统，该系统使用模拟 IDE 驱动器的读卡器启动紧凑型闪存卡。从字面上看，启动大约需要一个小时。超慢部分发生在 Grub 加载内核时。完成后，启动过程的其余部分只需大约一分钟即可进入登录提示。有没有人有什么建议？

我怀疑这可能与 UDMA 有关。我的 BIOS 中与 IDE 相关的所有内容似乎都已检出。读取性能 hdparm 告诉我 1.77 MB/s。哎哟! （但即使以这样的速度，解压和加载内核也不应该花一个小时）

 [root@server ~]# hdparm -tT /dev/hdc

/dev/hdc:
 Timing cached reads:   2444 MB in  2.00 seconds = 1222.04 MB/sec
 Timing buffered disk reads:    6 MB in  3.39 seconds =   1.77 MB/sec

尝试启用 DMA 是不行的：

[root@server ~]# hdparm -d1 /dev/hdc

/dev/hdc:
 setting using_dma to 1 (on)
 HDIO_SET_DMA failed: Operation not permitted
 using_dma    =  0 (off)

以下是一些可能有帮助的命令输出：

系统

[root@server ~]# uname -a
Linux server.localdomain 2.6.18-164.el5xen #1 SMP Thu Sep 3 04:47:32 EDT 2009 i686 i686 i386 GNU/Linux

PCI信息：

[root@server ~]# lspci -v
00:00.0 Host bridge: Intel Corporation 82945G/GZ/P/PL Memory Controller Hub (rev 02)
        Subsystem: Intel Corporation 82945G/GZ/P/PL Memory Controller Hub
        Flags: bus master, fast devsel, latency 0
        Capabilities: [e0] Vendor Specific Information

00:02.0 VGA compatible controller: Intel Corporation 82945G/GZ Integrated Graphics Controller (rev 02) (prog-if 00 [VGA controller])
        Subsystem: Intel Corporation 82945G/GZ Integrated Graphics Controller
        Flags: bus master, fast devsel, latency 0, IRQ 10
        Memory at fdf00000 (32-bit, non-prefetchable) [size=512K]
        I/O ports at ff00 [size=8]
        Memory at d0000000 (32-bit, prefetchable) [size=256M]
        Memory at fdf80000 (32-bit, non-prefetchable) [size=256K]
        Capabilities: [90] Message Signalled Interrupts: 64bit- Queue=0/0 Enable-
        Capabilities: [d0] Power Management version 2

00:1d.0 USB Controller: Intel Corporation 82801G (ICH7 Family) USB UHCI Controller #1 (rev 01) (prog-if 00 [UHCI])
        Subsystem: Intel Corporation 82801G (ICH7 Family) USB UHCI Controller #1
        Flags: bus master, medium devsel, latency 0, IRQ 16
        I/O ports at fe00 [size=32]

00:1d.1 USB Controller: Intel Corporation 82801G (ICH7 Family) USB UHCI Controller #2 (rev 01) (prog-if 00 [UHCI])
        Subsystem: Intel Corporation 82801G (ICH7 Family) USB UHCI Controller #2
        Flags: bus master, medium devsel, latency 0, IRQ 17
        I/O ports at fd00 [size=32]

00:1d.2 USB Controller: Intel Corporation 82801G (ICH7 Family) USB UHCI Controller #3 (rev 01) (prog-if 00 [UHCI])
        Subsystem: Intel Corporation 82801G (ICH7 Family) USB UHCI Controller #3
        Flags: bus master, medium devsel, latency 0, IRQ 18
        I/O ports at fc00 [size=32]

00:1d.3 USB Controller: Intel Corporation 82801G (ICH7 Family) USB UHCI Controller #4 (rev 01) (prog-if 00 [UHCI])
        Subsystem: Intel Corporation 82801G (ICH7 Family) USB UHCI Controller #4
        Flags: bus master, medium devsel, latency 0, IRQ 19
        I/O ports at fb00 [size=32]

00:1d.7 USB Controller: Intel Corporation 82801G (ICH7 Family) USB2 EHCI Controller (rev 01) (prog-if 20 [EHCI])
        Subsystem: Intel Corporation 82801G (ICH7 Family) USB2 EHCI Controller
        Flags: bus master, medium devsel, latency 0, IRQ 16
        Memory at fdfff000 (32-bit, non-prefetchable) [size=1K]
        Capabilities: [50] Power Management version 2
        Capabilities: [58] Debug port

00:1e.0 PCI bridge: Intel Corporation 82801 PCI Bridge (rev e1) (prog-if 01 [Subtractive decode])
        Flags: bus master, fast devsel, latency 0
        Bus: primary=00, secondary=01, subordinate=01, sec-latency=32
        I/O behind bridge: 0000d000-0000dfff
        Memory behind bridge: fde00000-fdefffff
        Prefetchable memory behind bridge: 00000000fdd00000-00000000fdd00000
        Capabilities: [50] #0d [0000]

00:1f.0 ISA bridge: Intel Corporation 82801GB/GR (ICH7 Family) LPC Interface Bridge (rev 01)
        Subsystem: Intel Corporation 82801GB/GR (ICH7 Family) LPC Interface Bridge
        Flags: bus master, medium devsel, latency 0
        Capabilities: [e0] Vendor Specific Information

00:1f.2 IDE interface: Intel Corporation 82801GB/GR/GH (ICH7 Family) SATA IDE Controller (rev 01) (prog-if 80 [Master])
        Subsystem: Intel Corporation 82801GB/GR/GH (ICH7 Family) SATA IDE Controller
        Flags: bus master, 66MHz, medium devsel, latency 0, IRQ 17
        I/O ports at <unassigned>
        I/O ports at <unassigned>
        I/O ports at <unassigned>
        I/O ports at <unassigned>
        I/O ports at f800 [size=16]
        Capabilities: [70] Power Management version 2

00:1f.3 SMBus: Intel Corporation 82801G (ICH7 Family) SMBus Controller (rev 01)
        Subsystem: Intel Corporation 82801G (ICH7 Family) SMBus Controller
        Flags: medium devsel, IRQ 17
        I/O ports at 0500 [size=32]

01:04.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL-8139/8139C/8139C+ (rev 10)
        Subsystem: Realtek Semiconductor Co., Ltd. RTL-8139/8139C/8139C+
        Flags: bus master, medium devsel, latency 32, IRQ 18
        I/O ports at de00 [size=256]
        Memory at fdeff000 (32-bit, non-prefetchable) [size=256]
        Capabilities: [50] Power Management version 2

01:06.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL-8139/8139C/8139C+ (rev 10)
        Subsystem: Realtek Semiconductor Co., Ltd. RTL-8139/8139C/8139C+
        Flags: bus master, medium devsel, latency 32, IRQ 17
        I/O ports at dc00 [size=256]
        Memory at fdefe000 (32-bit, non-prefetchable) [size=256]
        Capabilities: [50] Power Management version 2

01:07.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL-8139/8139C/8139C+ (rev 10)
        Subsystem: Realtek Semiconductor Co., Ltd. RTL-8139/8139C/8139C+
        Flags: bus master, medium devsel, latency 32, IRQ 19
        I/O ports at da00 [size=256]
        Memory at fdefd000 (32-bit, non-prefetchable) [size=256]
        Capabilities: [50] Power Management version 2

hdparm 输出：

[root@server ~]# hdparm  /dev/hdc   

/dev/hdc:
 multcount    =  0 (off)
 IO_support   =  0 (default 16-bit)
 unmaskirq    =  0 (off)
 using_dma    =  0 (off)
 keepsettings =  0 (off)
 readonly     =  0 (off)
 readahead    = 256 (on)
 geometry     = 8146/16/63, sectors = 8211168, start = 0

[root@server ~]# hdparm -I /dev/hdc

/dev/hdc:

ATA device, with non-removable media
        Model Number:       InnoDisk Corp. - iCF4000 4GB            
        Serial Number:      20091023AACA70000753
        Firmware Revision:  081107  
Standards:
        Supported: 5 
        Likely used: 6
Configuration:
        Logical         max     current
        cylinders       8146    8146
        heads           16      16
        sectors/track   63      63
        --
        CHS current addressable sectors:    8211168
        LBA    user addressable sectors:    8211168
        device size with M = 1024*1024:        4009 MBytes
        device size with M = 1000*1000:        4204 MBytes (4 GB)
Capabilities:
        LBA, IORDY(can be disabled)
        Standby timer values: spec'd by Vendor
        R/W multiple sector transfer: Max = 2   Current = 2
        DMA: mdma0 mdma1 mdma2 udma0 udma1 *udma2 udma3 udma4 
             Cycle time: min=120ns recommended=120ns
        PIO: pio0 pio1 pio2 pio3 pio4 
             Cycle time: no flow control=120ns  IORDY flow control=120ns
Commands/features:
        Enabled Supported:
           *    Power Management feature set
           *    WRITE_BUFFER command
           *    READ_BUFFER command
           *    NOP cmd
           *    CFA feature set
           *    Mandatory FLUSH_CACHE
HW reset results:
        CBLID- above Vih
        Device num = 0
CFA power mode 1:
        enabled and required by some commands
        Maximum current = 100ma
Checksum: correct

编辑： 通过“GRUB loading stage 2 ...”消息大约需要 5 分钟。我得出的结论是，问题可能是：引导加载程序、BIOS/固件或硬件问题。我已经玩过所有相关的 BIOS 设置，但没有任何运气，并更换了我的 IDE 电缆，以防万一我有一个坏的。我订购了一张新的紧凑型闪存卡（不同品牌），但要过几天才能到这里。我目前也在运行 Memtest86，看看我的 RAM 是否有奇怪的问题。完成后，我将查看是否有适用于我的主板的固件更新。

performance hard-drive linux centos

4 个回答

  1. Best Answer

    问题解决了！

    奇怪的是，在 BIOS 中禁用UDMA 解决了这个问题。

    感谢这个 Ubuntu 线程有答案。也感谢这里的每个人的建议！

    • 4

  2. 您很可能没有在内核中构建正确的驱动程序。此外，请确保您的 IDE 控制器已在 BIOS 中启用。

    否则，请发布 /var/log/dmesg 的内容

    谢谢

    • 0

  3. 在内核文件上尝试 GRUBtestload命令 - 这也很慢吗？

    • 0

  4. 我觉得你的磁盘缓冲区很慢！！其余的事情在我看来还可以..

    Timing buffered disk reads:    6 MB in  3.39 seconds =   1.77 MB/sec

    以下来自我正在运行的带有 SATA 的服务器

    [root@rajat Rajat]# hdparm -tT /dev/sda 

/dev/sda:
 Timing cached reads:   2368 MB in  2.00 seconds = 1184.65 MB/sec
 Timing buffered disk reads:  198 MB in  3.01 seconds =  65.73 MB/sec
    • 0

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