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    SubjectRe: 2.5.73-mm1 nbd: boot hang in add_disk at first call from nbd_init
    > On Saturday 28 June 2003 12:55, Michael Frank wrote:
    >> On Saturday 28 June 2003 10:41, Andrew Morton wrote:
    >> > Michael Frank <> wrote:
    >> > > Changes were recently made to the nbd.c in 2.5.73-mm1
    >> >
    >> > And tons more will be in -mm2, which I shall prepare right now. Please
    >> retest on that and if it still hangs, capture the output from pressing
    >> alt-sysrq-T.
    >> Legacy free, no serial port.
    >> Sorry, -mm2 hang at booting kernel on 2 machines.
    > Oh Murphy! Bug: 250K log buffer causes a hang on boot.
    > Sorry for the shock. I configured the log buffer bigger - 250K and it hangs
    > on boot.
    > Default 14K log buffer all OK, the NBD hang is fixed too.

    Default value of 14 is a shift count (2 << 14), which gives a
    16 KB buffer.
    Did you enter '250' for the shift value?
    Yes, that wouldn't boot.
    Maybe consult the help text??

    > This was my only config change besides that driver which didn't compile ;)
    > I want a bigger log buffer in preparation for testing swsusp on 2.5. On 2.4,
    > the test io load prevent the big swsusp logs from making it to disk...

    Andrew, do you want a min/max limit on the LOG_BUF_SHIFT value,
    now that Roman has added that feature for Kconfig?


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