On Mon, Sep 28, 2009 at 02:18:27PM +0200, Tomasz Torcz wrote: > > Hi, > > I'm using btrfs as rootfs on my Fedora 12 (rawhide) test system. > Every yum activity is very slow, like 15 minutes for installation of 11 > packages 25MB in size. Kernel is 2.6.31.1-48.fc12.x86_64, btrfs-progs-0.19-7.fc12.x86_64. > Hardware is pentium 4 3.0 GHz (Hyperthreading, 64 bit), with single IDE disk > on Intel ICH controller. You're doing quite a lot of reads, and some writes. Could you please capture the output of sysrq-w at 5s intervals during the upgrade? -chris > > /dev/sda2 on / type btrfs (rw) > > /dev/sda2 19G 6,7G 13G 36% / > > Attached is output from vmstat 1 during yum transaction. I also > have 200MB of "perf record" output, which I can drill down. First screen > of profile is below: > > # Samples: 9024736 > # > # Overhead Command Shared Object Symbol > # ........ ............... .................................................... ...... > # > 15.44% perf.2.6.31-33. [kernel] [k] kmem_cache_open > 9.74% perf.2.6.31-33. [kernel] [k] print_lock_contention_bug > 6.34% perf.2.6.31-33. [kernel] [k] free_kmem_cache_cpus > 4.49% perf.2.6.31-33. [kernel] [k] is_module_text_address > 4.01% perf.2.6.31-33. [kernel] [k] lock_set_class > 3.45% yum-complete-tr [kernel] [k] print_lock_contention_bug > 2.50% perf.2.6.31-33. [kernel] [k] _spin_lock > 2.48% yum-complete-tr [kernel] [k] kmem_cache_open > 2.47% perf.2.6.31-33. [kernel] [k] zlib_tr_flush_block [zlib_deflate] > 1.65% yum-complete-tr [kernel] [k] lock_set_class > 1.62% perf.2.6.31-33. [kernel] [k] schedule_hrtimeout_range > 1.53% perf.2.6.31-33. [kernel] [k] sysfs_slab_add > 1.50% yum-complete-tr [kernel] [k] zlib_tr_flush_block [zlib_deflate] > 1.46% yum-complete-tr [kernel] [k] free_kmem_cache_cpus > 1.40% yum-complete-tr [kernel] [k] _spin_lock > 1.34% perf.2.6.31-33. [kernel] [k] __mutex_lock_common > 1.27% perf.2.6.31-33. [kernel] [k] btrfs_getxattr [btrfs] > 1.06% perf.2.6.31-33. [kernel] [k] lock_contended > 0.78% perf.2.6.31-33. [kernel] [k] _raw_read_unlock > 0.75% perf.2.6.31-33. [kernel] [k] btrfs_listxattr [btrfs] > 0.74% perf.2.6.31-33. [kernel] [k] run_scheduled_bios [btrfs] > 0.62% perf.2.6.31-33. [kernel] [k] lockdep_count_backward_deps > 0.61% perf.2.6.31-33. [kernel] [k] show_slab_objects > 0.58% yum-complete-tr [kernel] [k] sysfs_slab_add > 0.48% yum-complete-tr /usr/lib64/libpython2.6.so.1.0 [.] 0x0000000005dab0 > 0.46% yum-complete-tr [kernel] [k] btrfs_listxattr [btrfs] > 0.45% yum-complete-tr /usr/lib64/librpm.so.0.0.0 [.] 0x0000000004877f > 0.44% perf.2.6.31-33. [kernel] [k] idr_for_each > 0.44% perf.2.6.31-33. [kernel] [k] clear_lock_stats > 0.44% yum-complete-tr [kernel] [k] lock_contended > 0.43% perf.2.6.31-33. [kernel] [k] btrfs_iget [btrfs] > 0.41% yum-complete-tr [kernel] [k] is_module_text_address > 0.37% yum-complete-tr /usr/lib64/libpython2.6.so.1.0 [.] PyEval_EvalFrameEx > 0.36% yum-complete-tr [kernel] [k] run_scheduled_bios [btrfs] > 0.36% yum-complete-tr [kernel] [k] show_slab_objects > 0.33% perf.2.6.31-33. [kernel] [k] lock_acquire > 0.33% perf.2.6.31-33. [kernel] [k] __module_text_address > 0.29% yum-complete-tr [kernel] [k] btrfs_getxattr [btrfs] > 0.28% ldconfig [kernel] [k] free_kmem_cache_cpus > 0.27% perf.2.6.31-33. [kernel] [k] btrfs_set_device_sector_size [btrfs] > 0.26% yum-complete-tr [kernel] [k] _raw_read_unlock > 0.25% perf.2.6.31-33. [kernel] [k] _spin_lock_bh > 0.25% yum-complete-tr [kernel] [k] btrfs_drop_extents [btrfs] > 0.23% perf.2.6.31-33. [kernel] [k] btrfs_comp_cpu_keys [btrfs] > 0.23% yum-complete-tr /lib64/libc-2.10.90.so [.] __GI_memcpy > > > > -- > Tomasz Torcz 72->| 80->| > xmpp: zdzichubg@xxxxxxxxx 72->| 80->| > -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
