Forgot to mention: bcache is in writeback mode
2013/12/19 Fábio Pfeifer <fmpfei...@gmail.com>: > Any update on this? > > I have here exactly the same issue. Kernel 3.12.5-1-ARCH, backing > device 500 GB IDE, cache 24 GB SSD => /dev/bcache0 > On /dev/bcache I also have 2 subvolumes, / and /home. I get lots of > messages in dmesg: > > (...) > [ 22.282469] BTRFS info (device bcache0): csum failed ino 56193 off > 212992 csum 519977505 expected csum 3166125439 > [ 22.282656] incomplete page read in btrfs with offset 1024 and length 3072 > [ 23.370872] incomplete page read in btrfs with offset 1024 and length 3072 > [ 23.370890] BTRFS info (device bcache0): csum failed ino 57765 off > 106496 csum 3553846164 expected csum 1299185721 > [ 23.505238] incomplete page read in btrfs with offset 2560 and length 1536 > [ 23.505256] BTRFS info (device bcache0): csum failed ino 75922 off > 172032 csum 1883678196 expected csum 1337496676 > [ 23.508535] incomplete page read in btrfs with offset 2560 and length 1536 > [ 23.508547] BTRFS info (device bcache0): csum failed ino 74368 off > 237568 csum 2863587994 expected csum 2693116460 > [ 25.683059] incomplete page read in btrfs with offset 2560 and length 1536 > [ 25.683078] BTRFS info (device bcache0): csum failed ino 123709 off > 57344 csum 1528117893 expected csum 2239543273 > [ 25.684339] incomplete page read in btrfs with offset 1024 and length 3072 > [ 26.622384] incomplete page read in btrfs with offset 1024 and length 3072 > [ 26.906718] incomplete page read in btrfs with offset 2560 and length 1536 > [ 27.823247] incomplete page read in btrfs with offset 1024 and length 3072 > [ 27.823265] btrfs_readpage_end_io_hook: 2 callbacks suppressed > [ 27.823271] BTRFS info (device bcache0): csum failed ino 34587 off > 16384 csum 1180114025 expected csum 474262911 > [ 28.490066] incomplete page read in btrfs with offset 2560 and length 1536 > [ 28.490085] BTRFS info (device bcache0): csum failed ino 65817 off > 327680 csum 3065880108 expected csum 2663659117 > [ 29.413824] incomplete page read in btrfs with offset 1024 and length 3072 > [ 41.913857] incomplete page read in btrfs with offset 2560 and length 1536 > [ 55.761753] incomplete page read in btrfs with offset 1024 and length 3072 > [ 55.761771] BTRFS info (device bcache0): csum failed ino 72835 off > 81920 csum 1511792656 expected csum 3733709121 > [ 69.636498] incomplete page read in btrfs with offset 2560 and length 1536 > (...) > > should I be worried? > > thanks, > > Fabio Pfeifer > > 2013/12/18 eb <e...@gmx.ch>: >> I've recently setup a system (Kernel 3.12.5-1-ARCH) which is layered as >> follows: >> >> /dev/sdb3 - cache0 (80 GB Intel SSD) >> /dev/sdc1 - backing device (2 TB WD HDD) >> >> sdb3+sdc1 => /dev/bcache0 >> >> On /dev/bcache0, there's a btrfs filesystem with 2 subvolumes, mounted >> as / and /home. What's been bothering me are the following entries in >> my kernel log: >> >> [13811.845540] incomplete page write in btrfs with offset 1536 and length >> 2560 >> [13870.326639] incomplete page write in btrfs with offset 3072 and length >> 1024 >> >> The offset/length values are always either 1536/2560 or 3072/1024, >> they sum up nicely to 4K. There are 607 of those in there as I am >> writing this, the machine has been up 18 hours and been under no >> particular I/O strain (it's a desktop). >> >> Trying to fix this, I unattached the cache (still using /dev/bcache0, >> but without /dev/sdb3 attached), causing these errors to disappear. As >> soon as I re-attached /dev/sdb3 they started again, so I am fairly >> sure it's an unfavorable interaction between bcache and btrfs. >> >> Is this something I should be worried about (they're only emitted with >> KERN_INFO?) or just an alignment problem? The underlying HDD is using >> 4K-Sectors, while the block_size of bcache seems to be 512, could that >> be the issue here? >> >> I've also encountered incomplete reads and a few csum errors, but I >> have not been able to trigger these regularly. I have a feeling that >> the error is more likely o be on the bcache end (I've mailed to that >> list as well), however any insight into the matter would be much >> appreciated. >> >> Thanks, >> >> - eb >> -- >> To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in >> the body of a message to majord...@vger.kernel.org >> More majordomo info at http://vger.kernel.org/majordomo-info.html -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
