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Diffstat (limited to 'results/scraper/launchpad-without-comments/1884831')
| -rw-r--r-- | results/scraper/launchpad-without-comments/1884831 | 21 |
1 files changed, 21 insertions, 0 deletions
diff --git a/results/scraper/launchpad-without-comments/1884831 b/results/scraper/launchpad-without-comments/1884831 new file mode 100644 index 000000000..3927b32cd --- /dev/null +++ b/results/scraper/launchpad-without-comments/1884831 @@ -0,0 +1,21 @@ +qemu-nbd fails to discard bigger chunks + +This report is moved from systemd to here: +https://github.com/systemd/systemd/issues/16242 + +A qemu-nbd device reports that it can discard a lot of bytes: + +cat /sys/block/nbd0/queue/discard_max_bytes +2199023255040 + +And indeed, discard works with small images: + +$ qemu-img create -f qcow2 /tmp/image.img 2M +$ sudo qemu-nbd --connect=/dev/nbd0 /tmp/image.img +$ sudo blkdiscard /dev/nbd0 + +but not for bigger ones (still smaller than discard_max_bytes): + +$ qemu-img create -f qcow2 /tmp/image.img 5G +$ sudo qemu-nbd --connect=/dev/nbd0 /tmp/image.img +$ sudo blkdiscard /dev/nbd0 \ No newline at end of file |