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README: FD caches are now cleared every 10 transactions

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Also some other minor editorial changes.

Signed-off-by: Zygo Blaxell <bees@furryterror.org>
This commit is contained in:
Zygo Blaxell 2018-02-14 21:04:33 -05:00
parent 9063c6442f
commit 2ac94438bd
1 changed files with 8 additions and 4 deletions
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README.md
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@ -312,20 +312,24 @@ Unfixed kernel bugs (as of 4.11.9) with workarounds in Bees:
hangs within a few hours, requiring a reboot to recover. On the other hangs within a few hours, requiring a reboot to recover. On the other
hand, the `fsync()` only costs about 8% of overall performance. hand, the `fsync()` only costs about 8% of overall performance.
Not really a bug, but a gotcha nonetheless: Not really bugs, but gotchas nonetheless:
* If a process holds a directory FD open, the subvol containing the * If a process holds a directory FD open, the subvol containing the
directory cannot be deleted (`btrfs sub del` will start the deletion directory cannot be deleted (`btrfs sub del` will start the deletion
process, but it will not proceed past the first open directory FD). process, but it will not proceed past the first open directory FD).
`btrfs-cleaner` will simply skip over the directory *and all of its `btrfs-cleaner` will simply skip over the directory *and all of its
children* until the FD is closed. Bees avoids this gotcha by closing children* until the FD is closed. Bees avoids this gotcha by closing
all of the FDs in its directory FD cache every 15 minutes. all of the FDs in its directory FD cache every 10 btrfs transactions.
* If a file is deleted while Bees is caching an open FD to the file, * If a file is deleted while Bees is caching an open FD to the file,
Bees continues to scan the file. For very large files (e.g. VM Bees continues to scan the file. For very large files (e.g. VM
images), the deletion of the file can be delayed indefinitely. images), the deletion of the file can be delayed indefinitely.
To limit this delay, Bees closes all FDs in its file FD cache every To limit this delay, Bees closes all FDs in its file FD cache every
15 minutes. 10 btrfs transactions.
* If a snapshot is deleted, bees will generate a burst of exceptions
for references to files in the snapshot that no longer exist. This
lasts until the FD caches are cleared.
Installation Installation
============ ============
@ -406,7 +410,7 @@ Dependencies
can trigger known performance bugs and hangs in dedup-related functions. can trigger known performance bugs and hangs in dedup-related functions.
When in doubt, use a newer kernel version. As of kernel 4.15.3 there When in doubt, use a newer kernel version. As of kernel 4.15.3 there
is no released Linux kernel that has no known bugs. is no released Linux kernel that has no relevant known bugs.
* markdown * markdown