On Sat, Feb 25, 2012 at 09:14:01AM +1030, Jordan Windsor wrote: > I'm running Ubuntu under KVM, with btrfs on the host where the > Qemu/KVM image is stored, the VM was also running at the time. I was > going to check something unrelated in the dmesg output, as I did that > I noticed some errors in it about btrfs here they are: > > > [ 4294.431807] btrfs: block rsv returned -28 > [ 4294.431811] ------------[ cut here ]------------ > [ 4294.431831] WARNING: at fs/btrfs/extent-tree.c:5985
This is a warning and it shows up from time to time, accross recent releases. > This didn't cause any crashes or related issues, also unrelated (I > think?) is that I get very low performance (about 5MBps according to > iostat) in a guest under Qemu/KVM. > 3.2.7-1-ARCH x86_64 Arch Linux Yes, the performance goes down as some pathological should-not-happen code path is taken. I myself haven't seen this error recently during testing, but at the time I did, it slowed down the machine for a while, ie. it's not a inifinite loop. Seems there's a dark corner of space reservations left for Josef. david -- 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
