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    None. NCQ requests are unordered, just like SCSI...

    None. NCQ requests are unordered, just like SCSI TCQ (well, SCSI does optionally have ordered tag semantics, but nothing supports that due to problems with the spec etc.).



    No.



    No.
  2. It's from POSIX actually. See e.g....

    It's from POSIX actually. See e.g. http://pubs.opengroup.org/onlinepubs/9699919799/functions/open.html . And yes, there is a difference between a file description and a file descriptor. From the...
  3. Trade politics vs. influence of spooks?

    So one of the companies involved in this is T-platforms, a Russian supercomputer company which recently had some trouble due to using American technology. From wikipedia:



    T-platforms...
  4. If you're using the gcc family compilers, you...

    If you're using the gcc family compilers, you really should look into the -pipe option. Or failing that, just put /tmp on a tmpfs. Or do both.
  5. Gecko, and the rest of firefox (and thunderbird,...

    Gecko, and the rest of firefox (and thunderbird, and presumably the rest of mozilla software as well) is nowadays actually MPLv2. Prior to the MPLv2, they used a MPLv1/GPLv2+/LGPLv2.1+ tri-license.
    ...
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    People are perfectly entitled to have inane and...

    People are perfectly entitled to have inane and pointless hobbies, such as golf, if they so like. Just because you like to imagine that your little game might in the future bring in some money does...
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    No, not really. No. In some limited...

    No, not really.



    No.



    In some limited circumstances, maybe.
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    Yes, in such a situation a database engine can...

    Yes, in such a situation a database engine can get away with using fdatasync() instead of fsync(). The filesystem still needs to have barrier support in order to provide data integrity guarantees...
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    Sure, a filesystem which doesn't support barriers...

    Sure, a filesystem which doesn't support barriers (such as JFS or ext2) will obviously outperform one which does (e.g. ext4, btrfs, xfs) on a test which tests synchronous writes (fsync()). In order...
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    ext4 is the default fs in RHEL6. If you're stuck...

    ext4 is the default fs in RHEL6. If you're stuck on an older release, well, sucks to be you.. :p

    (Another big advantage of ext4 over ext3 in addition to the ones mentioned previously is much...
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    COW "converts" a bunch of random writes into...

    COW "converts" a bunch of random writes into sequential writes; the downside is that the files will become more fragmented than with a traditional update-in-place filesystem.
  12. www.intel.com/idf/library/pdf/sf_2011/SF11_SPCS005...

    www.intel.com/idf/library/pdf/sf_2011/SF11_SPCS005_101F.pdf says

    """Fast access of FS & GS base registers
    – Useful for user level thread storage by providing 4 new instructions
    for ring-3 access...
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    Modern x86 (and IIRC SPARC) processors have hw...

    Modern x86 (and IIRC SPARC) processors have hw accelerated CRC32C. "Luckily", the exact same polynomial is used in the btrfs and ext4 crc checksum, among others, allowing those to benefit from the hw...
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    Genode is popular? So, uh, who uses it?

    Genode is popular? So, uh, who uses it?
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    Here, for instance:...

    Here, for instance: https://people.apache.org/~jim/presos/ACNA11/Apache_httpd_cloud.pdf
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    Yes; I agree. As a minor point, the current...

    Yes; I agree. As a minor point, the current x86-based Altix UV systems are also CC-NUMA; except for the change in processors and an upgraded interconnect they are basically the same as the old...
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    I believe that, but in no way does that refute...

    I believe that, but in no way does that refute what I said, since I didn't claim that ALL highend storage systems have features to catch data corruption. Merely that they OFTEN have such features,...
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    XFS is about as safe as other mainstream Linux...

    XFS is about as safe as other mainstream Linux filesystems, with the exception of btrfs. Thus your point is irrelevant, since the topic is scalability.

    Yes, ZFS/BTRFS are (or will be, once they...
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    "the workload"? What workload? But no, I...

    "the workload"? What workload?

    But no, I don't think, and I've never claimed, that ext4 has some über-good scalability. The SGI Altix systems, FWIW, use XFS AFAIK. XFS has been designed to...
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    And? This is like arguing that because Solaris 11...

    And? This is like arguing that because Solaris 11 has an updated graphics stack with KMS/DRI2/whatnot => Solaris doesn't scale.



    A high-margin/low volume market can be profitable, but the...
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