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    SubjectRe: True fsync() in Linux (on IDE)
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    Date
    On Thu, 2004-03-18 at 12:11, Chris Mason wrote:

    > > I believe some missed set_page_writeback() calls caused fsync() to never
    > > really wait on anything, pretty broken... IIRC, it's fixed in latest
    > > -mm, or maybe it's just pending for next release.
    >
    > This should have only been broken in -mm. Which kernels exactly are you
    > comparing? Maybe the 3ware array defaults to different writecache
    > settings under 2.6?

    I'm trying RH AS 3.0 kernel, however I have the same behavior on my
    SuSE 8.2 workstation.

    I use 2.6.3 kernel for tests now (It is not the latest I know)
    EXT3 file system.

    3WARE has writeback cache setting in both cases.


    Here is the test program I was using:


    #include <stdio.h>
    #include <fcntl.h>
    #include <sys/types.h>
    #include <sys/stat.h>
    #include <errno.h>


    char buffer[4096] __attribute__((__aligned__(4096)));

    main()
    {
    int rc2,rc;
    int i;
    buffer[0]=(char)getpid();
    rc=open("write",O_RDWR | O_CREAT,0666);
    if (rc==-1) printf("Error at open: %d\n",errno);
    for(i=0;i<1000;i++)
    {
    rc2=write(rc,&buffer,4096);
    printf(".");
    fflush(stdout);
    if (rc2<0)
    {
    printf("Error code: %d\n",errno);
    return;
    }
    fsync(rc);
    }

    }





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    Peter Zaitsev, Senior Support Engineer
    MySQL AB, www.mysql.com

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