I'm afraid it's not too helpful that when trying to rectify this unacceptable performance by going the way of custom-building a mainline kernel (something I'm doing _all the time_ on other installations), one then runs into another tarpit as mentioned in "Kernel Panic + Intel SATA":, caused by weak device name support in initrd (nash mkrootdev issue, no root fs found no matter how one tries to correct it, with hundreds of people stumped in various Google results on RHEL5, FC6 etc.). Workaround: Install newer Linux kernel or Fedora Core. The HP dc7800 desktop PC is Certified and Supported by RedHat, see I/O performance should be above 50 MB/sec. Version-Release number of selected component (if applicable):ġ. Support of Intel Q35 Express from later Linux kernels. The solution would seem to be backporting the We have also built and installed the Linux kernel versionĢ.4.26.2 on the RHEL 5.2 system, and this kernel fixes the problem as well.Ĭonclusion: The RHEL kernel 2.6.18-84.el5 (and older) doesn't support the Intel FC9 detects the hard diskĪs /dev/sda, and writing a big file as above gives a disk I/O speed of 55-60 We have installed Fedora Core 9 on the same hardware. The fact that the disk is denoted as /dev/hda in stead of the expected /dev/sda # time dd if=/dev/zero of=temp bs=1024k count=5000ĥ242880000 bytes (5.2 GB) copied, 978.086 seconds, 5.4 MB/sĪnother symptom of the problem is that DMA is turned off (and cannot be turned on): We test I/O performance by writing a large file to disk: The built-in SATA hard disk of the HP dc7800 desktop PC (with Intel Q35 ExpressĬhipset) is incorrectly configured, and disk I/O performance is more than 10
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