SSD v Linuxu (diskuse)

[alkoholik]

"U nich jsem hned přidal relatime, po příštím bootu se uvidí, jestli je rozdíl patrný :)"
Zkus bez rebootu mount -o remount,relatime /.

[platYpus]

co se tyce mountu, tak bych u SSD uvazoval o "-noatime"

[Milan Lajtoš]

Ešte aj nodiratime.

[R]

Zbytocne. "nodiratime" je podmnozina "noatime".

[Milan Lajtoš]

Pred dvoma týždňami som si kúpil OCZ Vertex 2 60GB. Len škoda, že ho nemôžem naplno využiť, keďže mám len SATA1. :(

$ hdparm -Tt /dev/sda

/dev/sda:
 Timing cached reads:   7748 MB in  1.99 seconds = 3885.93 MB/sec
 Timing buffered disk reads: 498 MB in  3.01 seconds = 165.49 MB/sec

[Genunix]

Já používám tyto připojovací parametry:

/dev/mapper/vg0-root on / type ext4 (rw,noatime,nodiratime,discard,nobh,commit=60)
/dev/mapper/vg0-home on /home type ext4 (rw,noexec,nosuid,nodev,noatime,nodiratime,nouser_xattr,discard,nobh,commit=60,acl)

Samozřejmě na ext4 vypnutý žurnál, scheduler noop. Namountované tmpfs na /var/log a /tmp (+ link /var/tmp), abych snížil zápisy na minimum.

$ hdparm -Tt /dev/sda

/dev/sda:
 Timing cached reads:   2458 MB in  2.00 seconds = 1230.10 MB/sec
 Timing buffered disk reads:  730 MB in  3.00 seconds = 243.07 MB/sec

[Milan Lajtoš]

Akurát som skúsil TRIM cez parameter discard a začal mi mrznúť systém:

Dec  5 11:18:01 babraq kernel: BUG: scheduling while atomic: dbus-launch/2013/0x00000002
Dec  5 11:18:01 babraq kernel: Modules linked in: coretemp cpufreq_ondemand freq_table hid_apple usbhid hid joydev tpm_infineon uvcvideo videodev v4l1_compat v4l2_compat_ioctl32 arc4 ecb 
snd_hda_codec_si3054 snd_h
da_codec_realtek snd_seq_dummy snd_seq_oss iwlagn snd_seq_midi_event snd_seq snd_seq_device snd_hda_intel snd_pcm_oss iwlcore snd_hda_codec snd_mixer_oss uhci_hcd snd_hwdep mac80211 sdhci_pci tg3 sdhci 
snd_pcm tpm
_tis snd_timer firewire_ohci libphy ehci_hcd battery tpm mmc_core firewire_core tpm_bios ac wmi led_class crc_itu_t cfg80211 snd compal_laptop processor usbcore psmouse soundcore sg rfkill evdev thermal 
serio_raw 
i2c_i801 snd_page_alloc pcspkr iTCO_wdt iTCO_vendor_support shpchp intel_agp pci_hotplug ext4 mbcache jbd2 crc16 sr_mod cdrom sd_mod pata_acpi ata_piix libata scsi_mod nouveau ttm drm_kms_helper drm 
i2c_algo_bit v
ideo output i2c_core button
Dec  5 11:18:01 babraq kernel: Pid: 2013, comm: dbus-launch Not tainted 2.6.36-ARCH #1
Dec  5 11:18:01 babraq kernel: Call Trace:
Dec  5 11:18:01 babraq kernel: [<ffffffff81045ed1>] __schedule_bug+0x61/0x70
Dec  5 11:18:01 babraq kernel: [<ffffffff8139311b>] schedule+0x89b/0x9c0
Dec  5 11:18:01 babraq kernel: [<ffffffff8139379d>] schedule_timeout+0x21d/0x360
Dec  5 11:18:01 babraq kernel: [<ffffffff811d303d>] ? generic_make_request+0x2cd/0x550
Dec  5 11:18:01 babraq kernel: [<ffffffff81392740>] wait_for_common+0xc0/0x150
Dec  5 11:18:01 babraq kernel: [<ffffffff8104e690>] ? default_wake_function+0x0/0x10
Dec  5 11:18:01 babraq kernel: [<ffffffff811d333b>] ? submit_bio+0x7b/0x100
Dec  5 11:18:01 babraq kernel: [<ffffffff81392878>] wait_for_completion+0x18/0x20
Dec  5 11:18:01 babraq kernel: [<ffffffff811da8b9>] blkdev_issue_discard+0x1b9/0x210
Dec  5 11:18:01 babraq kernel: [<ffffffffa025a7b6>] ext4_free_blocks+0x696/0xb80 [ext4]
Dec  5 11:18:01 babraq kernel: [<ffffffffa0251c38>] ? __ext4_handle_dirty_metadata+0x118/0x120 [ext4]
Dec  5 11:18:01 babraq kernel: [<ffffffffa0250f5c>] ext4_ext_truncate+0x8dc/0xa80 [ext4]
Dec  5 11:18:01 babraq kernel: [<ffffffff811ed957>] ? __prop_inc_single+0x57/0x60
Dec  5 11:18:01 babraq kernel: [<ffffffffa0231bd8>] ext4_truncate+0x178/0x5e0 [ext4]
Dec  5 11:18:01 babraq kernel: [<ffffffff810fe08a>] ? unmap_mapping_range+0xaa/0x270
Dec  5 11:18:01 babraq kernel: [<ffffffff810eb9a6>] vmtruncate+0x56/0x70
Dec  5 11:18:01 babraq kernel: [<ffffffffa0232baa>] ext4_setattr+0x14a/0x460 [ext4]
Dec  5 11:18:01 babraq kernel: [<ffffffff811461cc>] notify_change+0x18c/0x380
Dec  5 11:18:01 babraq kernel: [<ffffffff8112c5cf>] do_truncate+0x5f/0x90
Dec  5 11:18:01 babraq kernel: [<ffffffff811b043a>] ? security_inode_permission+0x1a/0x20
Dec  5 11:18:01 babraq kernel: [<ffffffff811baaf1>] ? tomoyo_path_truncate+0x11/0x20
Dec  5 11:18:01 babraq kernel: [<ffffffff8113bad9>] do_last+0x5f9/0x790
Dec  5 11:18:01 babraq kernel: [<ffffffff8113be5d>] do_filp_open+0x1ed/0x680
Dec  5 11:18:01 babraq kernel: [<ffffffff81138407>] ? d_alloc_and_lookup+0x47/0x90
Dec  5 11:18:01 babraq kernel: [<ffffffff81139c6e>] ? putname+0x2e/0x40
Dec  5 11:18:01 babraq kernel: [<ffffffff811473f4>] ? alloc_fd+0xf4/0x150
Dec  5 11:18:01 babraq kernel: [<ffffffff8112d400>] do_sys_open+0x60/0x120
Dec  5 11:18:01 babraq kernel: [<ffffffff8100d1cd>] ? math_state_restore+0x3d/0x60
Dec  5 11:18:01 babraq kernel: [<ffffffff8112d4db>] sys_open+0x1b/0x20
Dec  5 11:18:01 babraq kernel: [<ffffffff8100af42>] system_call_fastpath+0x16/0x1b