Repository files (latest commit first)

Filename	Latest commit message	Latest commit date
Dan Williams 8a4aeec8d2 libata/ahci: accommodate tag ordered controllers ... The AHCI spec allows implementations to issue commands in tag order rather than FIFO order: 5.3.2.12 P:SelectCmd HBA sets pSlotLoc = (pSlotLoc + 1) mod (CAP.NCS + 1) or HBA selects the command to issue that has had the PxCI bit set to '1' longer than any other command pending to be issued. The result is that commands posted sequentially (time-wise) may play out of sequence when issued by hardware. This behavior has likely been hidden by drives that arrange for commands to complete in issue order. However, it appears recent drives (two from different vendors that we have found so far) inflict out-of-order completions as a matter of course. So, we need to take care to maintain ordered submission, otherwise we risk triggering a drive to fall out of sequential-io automation and back to random-io processing, which incurs large latency and degrades throughput. This issue was found in simple benchmarks where QD=2 seq-write performance was 30-50% *greater* than QD=32 seq-write performance. Tagging for -stable and making the change globally since it has a low risk-to-reward ratio. Also, word is that recent versions of an unnamed OS also does it this way now. So, drives in the field are already experienced with this tag ordering scheme. Cc: <stable@vger.kernel.org> Cc: Dave Jiang <dave.jiang@intel.com> Cc: Ed Ciechanowski <ed.ciechanowski@intel.com> Reviewed-by: Matthew Wilcox <matthew.r.wilcox@intel.com> Signed-off-by: Dan Williams <dan.j.williams@intel.com> Signed-off-by: Tejun Heo <tj@kernel.org>		2014-04-18 15:56:03 -04:00
..
acard-ahci.c	ata: delete non-required instances of include <linux/init.h>	2014-02-13 16:40:56 -05:00
ahci.c	ahci: Do not receive interrupts sent by dummy ports	2014-04-18 15:55:57 -04:00
ahci.h	ahci: Ensure "MSI Revert to Single Message" mode is not enforced	2014-04-17 09:58:48 -04:00
ahci_da850.c	ata: add new-style AHCI platform driver for DaVinci DA850 AHCI controller	2014-03-25 15:17:13 -04:00
ahci_imx.c	ahci_imx: Put #ifdef CONFIG_PM_SLEEP around suspend / resume functions	2014-03-06 14:31:13 -05:00
ahci_platform.c	ata: move library code from ahci_platform.c to libahci_platform.c	2014-03-25 15:17:13 -04:00
ahci_st.c	ata: ahci_st: remove deprecated struct ahci_platform_data usage	2014-03-14 14:26:29 -04:00
ahci_sunxi.c	ata: ahci_sunxi: fix code formatting	2014-03-17 10:46:54 -04:00
ahci_xgene.c	ata: Fix compiler warning with APM X-Gene host controller driver	2014-03-18 16:01:04 -04:00
ata_generic.c	ata: delete non-required instances of include <linux/init.h>	2014-02-13 16:40:56 -05:00
ata_piix.c
Kconfig	ata: fix i.MX AHCI driver dependencies	2014-04-08 08:31:48 -04:00
libahci.c	ata: remove superfluous casts	2014-03-26 12:36:53 -04:00
libahci_platform.c	ata: move library code from ahci_platform.c to libahci_platform.c	2014-03-25 15:17:13 -04:00
libata-acpi.c	ACPI and power management updates for 3.15-rc1	2014-04-01 12:48:54 -07:00
libata-core.c	libata/ahci: accommodate tag ordered controllers	2014-04-18 15:56:03 -04:00
libata-eh.c	libata, libsas: kill pm_result and related cleanup	2014-03-18 16:08:38 -04:00
libata-pmp.c	ata: enable quirk from jmicron JMB350 for JMB394	2014-01-31 07:05:44 -05:00
libata-scsi.c
libata-sff.c
libata-transport.c
libata-transport.h
libata-zpodd.c	libata: zpodd: eliminate odd_can_poweroff	2014-03-14 11:23:47 -04:00
libata.h
Makefile	ata: add new-style AHCI platform driver for DaVinci DA850 AHCI controller	2014-03-25 15:17:13 -04:00
pata_acpi.c	ata: delete non-required instances of include <linux/init.h>	2014-02-13 16:40:56 -05:00
pata_ali.c
pata_amd.c	ata: delete non-required instances of include <linux/init.h>	2014-02-13 16:40:56 -05:00
pata_arasan_cf.c	pata_arasan_cf: fix ata_host_activate() failure handling	2014-04-14 13:50:03 -04:00
pata_artop.c	ata: delete non-required instances of include <linux/init.h>	2014-02-13 16:40:56 -05:00
pata_at32.c
pata_at91.c	pata_at91: fix ata_host_activate() failure handling	2014-04-02 13:17:31 -04:00
pata_atiixp.c	ata: delete non-required instances of include <linux/init.h>	2014-02-13 16:40:56 -05:00
pata_atp867x.c	ata: delete non-required instances of include <linux/init.h>	2014-02-13 16:40:56 -05:00
pata_bf54x.c
pata_cmd64x.c	ata: delete non-required instances of include <linux/init.h>	2014-02-13 16:40:56 -05:00
pata_cmd640.c	ata: delete non-required instances of include <linux/init.h>	2014-02-13 16:40:56 -05:00
pata_cs5520.c	ata: delete non-required instances of include <linux/init.h>	2014-02-13 16:40:56 -05:00
pata_cs5530.c	ata: delete non-required instances of include <linux/init.h>	2014-02-13 16:40:56 -05:00
pata_cs5535.c	ata: delete non-required instances of include <linux/init.h>	2014-02-13 16:40:56 -05:00
pata_cs5536.c	ata: delete non-required instances of include <linux/init.h>	2014-02-13 16:40:56 -05:00
pata_cypress.c	ata: delete non-required instances of include <linux/init.h>	2014-02-13 16:40:56 -05:00
pata_efar.c	ata: delete non-required instances of include <linux/init.h>	2014-02-13 16:40:56 -05:00
pata_ep93xx.c	ata: delete non-required instances of include <linux/init.h>	2014-02-13 16:40:56 -05:00
pata_hpt3x2n.c	ata: delete non-required instances of include <linux/init.h>	2014-02-13 16:40:56 -05:00
pata_hpt3x3.c	ata: delete non-required instances of include <linux/init.h>	2014-02-13 16:40:56 -05:00
pata_hpt37x.c	ata: delete non-required instances of include <linux/init.h>	2014-02-13 16:40:56 -05:00
pata_hpt366.c	ata: delete non-required instances of include <linux/init.h>	2014-02-13 16:40:56 -05:00
pata_icside.c
pata_imx.c	Merge branch 'for-3.15' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/libata	2014-03-31 15:27:37 -07:00
pata_isapnp.c
pata_it821x.c	ata: delete non-required instances of include <linux/init.h>	2014-02-13 16:40:56 -05:00
pata_it8213.c	ata: delete non-required instances of include <linux/init.h>	2014-02-13 16:40:56 -05:00
pata_ixp4xx_cf.c
pata_jmicron.c	ata: delete non-required instances of include <linux/init.h>	2014-02-13 16:40:56 -05:00
pata_legacy.c	pata_legacy: Remove dead code	2014-03-11 08:30:53 -04:00
pata_macio.c
pata_marvell.c	ata: delete non-required instances of include <linux/init.h>	2014-02-13 16:40:56 -05:00
pata_mpc52xx.c
pata_mpiix.c	ata: delete non-required instances of include <linux/init.h>	2014-02-13 16:40:56 -05:00
pata_netcell.c	ata: delete non-required instances of include <linux/init.h>	2014-02-13 16:40:56 -05:00
pata_ninja32.c	ata: delete non-required instances of include <linux/init.h>	2014-02-13 16:40:56 -05:00
pata_ns87410.c	ata: delete non-required instances of include <linux/init.h>	2014-02-13 16:40:56 -05:00
pata_ns87415.c	ata: delete non-required instances of include <linux/init.h>	2014-02-13 16:40:56 -05:00
pata_octeon_cf.c
pata_of_platform.c
pata_oldpiix.c	ata: delete non-required instances of include <linux/init.h>	2014-02-13 16:40:56 -05:00
pata_opti.c	ata: delete non-required instances of include <linux/init.h>	2014-02-13 16:40:56 -05:00
pata_optidma.c	ata: delete non-required instances of include <linux/init.h>	2014-02-13 16:40:56 -05:00
pata_palmld.c
pata_pcmcia.c	ata: delete non-required instances of include <linux/init.h>	2014-02-13 16:40:56 -05:00
pata_pdc202xx_old.c	ata: delete non-required instances of include <linux/init.h>	2014-02-13 16:40:56 -05:00
pata_pdc2027x.c	ata: delete non-required instances of include <linux/init.h>	2014-02-13 16:40:56 -05:00
pata_piccolo.c	ata: delete non-required instances of include <linux/init.h>	2014-02-13 16:40:56 -05:00
pata_platform.c	ata: delete non-required instances of include <linux/init.h>	2014-02-13 16:40:56 -05:00
pata_pxa.c	ata: delete non-required instances of include <linux/init.h>	2014-02-13 16:40:56 -05:00
pata_radisys.c	ata: delete non-required instances of include <linux/init.h>	2014-02-13 16:40:56 -05:00
pata_rb532_cf.c
pata_rdc.c	ata: delete non-required instances of include <linux/init.h>	2014-02-13 16:40:56 -05:00
pata_rz1000.c	ata: delete non-required instances of include <linux/init.h>	2014-02-13 16:40:56 -05:00
pata_samsung_cf.c	pata_samsung_cf: fix ata_host_activate() failure handling	2014-04-15 08:48:56 -04:00
pata_sc1200.c	ata: delete non-required instances of include <linux/init.h>	2014-02-13 16:40:56 -05:00
pata_scc.c	ata: delete non-required instances of include <linux/init.h>	2014-02-13 16:40:56 -05:00
pata_sch.c	ata: delete non-required instances of include <linux/init.h>	2014-02-13 16:40:56 -05:00
pata_serverworks.c	ata: delete non-required instances of include <linux/init.h>	2014-02-13 16:40:56 -05:00
pata_sil680.c	ata: delete non-required instances of include <linux/init.h>	2014-02-13 16:40:56 -05:00
pata_sis.c	ata: delete non-required instances of include <linux/init.h>	2014-02-13 16:40:56 -05:00
pata_sl82c105.c	ata: delete non-required instances of include <linux/init.h>	2014-02-13 16:40:56 -05:00
pata_triflex.c	ata: delete non-required instances of include <linux/init.h>	2014-02-13 16:40:56 -05:00
pata_via.c	ata: delete non-required instances of include <linux/init.h>	2014-02-13 16:40:56 -05:00
pdc_adma.c	ata: delete non-required instances of include <linux/init.h>	2014-02-13 16:40:56 -05:00
sata_dwc_460ex.c	ata: remove superfluous casts	2014-03-26 12:36:53 -04:00
sata_fsl.c
sata_highbank.c	ata: sata_highbank: remove superfluous cast	2014-03-26 11:42:01 -04:00
sata_inic162x.c
sata_mv.c	Merge branch 'for-3.14-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/libata	2014-02-20 12:04:15 -08:00
sata_nv.c	ata: delete non-required instances of include <linux/init.h>	2014-02-13 16:40:56 -05:00
sata_promise.c	ata: delete non-required instances of include <linux/init.h>	2014-02-13 16:40:56 -05:00
sata_promise.h
sata_qstor.c	ata: delete non-required instances of include <linux/init.h>	2014-02-13 16:40:56 -05:00
sata_rcar.c
sata_sil.c	Merge branch 'for-3.15' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/libata	2014-03-31 15:27:37 -07:00
sata_sil24.c
sata_sis.c	ata: delete non-required instances of include <linux/init.h>	2014-02-13 16:40:56 -05:00
sata_svw.c	ata: delete non-required instances of include <linux/init.h>	2014-02-13 16:40:56 -05:00
sata_sx4.c	ata: remove superfluous casts	2014-03-26 12:36:53 -04:00
sata_uli.c	ata: delete non-required instances of include <linux/init.h>	2014-02-13 16:40:56 -05:00
sata_via.c	ata: delete non-required instances of include <linux/init.h>	2014-02-13 16:40:56 -05:00
sata_vsc.c	ata: delete non-required instances of include <linux/init.h>	2014-02-13 16:40:56 -05:00
sis.h