Displaying 3 results from an estimated 3 matches for "unconfrol".
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2020 Aug 07
2
Re: [PATCH nbdkit] file: Implement cache=none and fadvise=normal|random|sequential.
On Fri, Aug 07, 2020 at 05:29:24PM +0300, Nir Soffer wrote:
> On Fri, Aug 7, 2020 at 5:07 PM Richard W.M. Jones <rjones@redhat.com> wrote:
> > These ones?
> > https://www.redhat.com/archives/libguestfs/2020-August/msg00078.html
>
> No, we had a bug when copying image from glance caused sanlock timeouts
> because of the unpredictable page cache flushes.
>
> We
2020 Aug 10
1
Re: [PATCH nbdkit] file: Implement cache=none and fadvise=normal|random|sequential.
...O_DIRECT and POSIX_FADV_DONTNEED are not exactly equivalent, I
> > think I've shown here that DONTNEED can be used to avoid polluting the
> > page cache.
>
> This fixes the minor issue of polluting the page cache, but it does not help
> to avoid stale data in the cache, or unconfrolled flushes.
>
> The bug I mentioned is:
> https://bugzilla.redhat.com/1832967
>
> This explains the issue:
> https://bugzilla.redhat.com/1247135#c29
>
> And here you can how unrelated I/O is affected by uncontrolled flushes:
> https://bugzilla.redhat.com/1247135#c30
>...
2020 Aug 07
0
Re: [PATCH nbdkit] file: Implement cache=none and fadvise=normal|random|sequential.
...ile it is true
> that O_DIRECT and POSIX_FADV_DONTNEED are not exactly equivalent, I
> think I've shown here that DONTNEED can be used to avoid polluting the
> page cache.
This fixes the minor issue of polluting the page cache, but it does not help
to avoid stale data in the cache, or unconfrolled flushes.
The bug I mentioned is:
https://bugzilla.redhat.com/1832967
This explains the issue:
https://bugzilla.redhat.com/1247135#c29
And here you can how unrelated I/O is affected by uncontrolled flushes:
https://bugzilla.redhat.com/1247135#c30
https://bugzilla.redhat.com/1247135#c36
Here w...