Lecturas SSD sorprendentemente lentas en Debian Jessie

Lecturas SSD sorprendentemente lentas en Debian Jessie

Instalé una computadora de escritorio después de nueve meses en el ático. De alguna manera dudo que esto esté relacionado, pero no recuerdo que haya sido así.

Tomó aproximadamente seis minutos para iniciar, un par de minutos más para que apareciera la pantalla de inicio de sesión de la GUI y un par de minutos más para que apareciera el administrador de escritorio.

hdparm dio el siguiente resultado:

# hdparm -tT /dev/sda
/dev/sda:
 Timing cached reads:     2 MB in  3.75 seconds = 545.64 kB/sec
 Timing buffered disk reads:   2 MB in  4.45 seconds = 459.91 kB/sec

Luego ejecuté fstrim así:

# fstrim -a -v
/home: 23.4 GiB (25130262528 bytes) trimmed
/boot: 397.1 MiB (416373760 bytes) trimmed
/: 5.2 GiB (5628624896 bytes) trimmed

hdparm mejoró un poco:

# hdparm -tT /dev/sda
/dev/sda:
 Timing cached reads:   23604 MB in  2.00 seconds = 11811.48 MB/sec
 Timing buffered disk reads:  54 MB in  4.27 seconds =  12.65 MB/sec

salida inteligente:

# smartctl  -i -A /dev/sda
smartctl 6.4 2014-10-07 r4002 [x86_64-linux-3.16.0-4-amd64] (local build)
Copyright (C) 2002-14, Bruce Allen, Christian Franke, www.smartmontools.org

=== START OF INFORMATION SECTION ===
Model Family:     Samsung based SSDs
Device Model:     Samsung SSD 840 EVO 120GB
Serial Number:    S1D5NSADB80933H
LU WWN Device Id: 5 002538 8a00db98b
Firmware Version: EXT0BB0Q
User Capacity:    120,034,123,776 bytes [120 GB]
Sector Size:      512 bytes logical/physical
Rotation Rate:    Solid State Device
Device is:        In smartctl database [for details use: -P show]
ATA Version is:   ACS-2, ATA8-ACS T13/1699-D revision 4c
SATA Version is:  SATA 3.1, 6.0 Gb/s (current: 6.0 Gb/s)
Local Time is:    Tue Jun 21 14:20:49 2016 BST
SMART support is: Available - device has SMART capability.
SMART support is: Enabled

=== START OF READ SMART DATA SECTION ===
SMART Attributes Data Structure revision number: 1
Vendor Specific SMART Attributes with Thresholds:
ID# ATTRIBUTE_NAME          FLAG     VALUE WORST THRESH TYPE      UPDATED  WHEN_FAILED RAW_VALUE
  5 Reallocated_Sector_Ct   0x0033   100   100   010    Pre-fail  Always       -       0
  9 Power_On_Hours          0x0032   098   098   000    Old_age   Always       -       7651
 12 Power_Cycle_Count       0x0032   099   099   000    Old_age   Always       -       694
177 Wear_Leveling_Count     0x0013   089   089   000    Pre-fail  Always       -       126
179 Used_Rsvd_Blk_Cnt_Tot   0x0013   100   100   010    Pre-fail  Always       -       0
181 Program_Fail_Cnt_Total  0x0032   100   100   010    Old_age   Always       -       0
182 Erase_Fail_Count_Total  0x0032   100   100   010    Old_age   Always       -       0
183 Runtime_Bad_Block       0x0013   100   100   010    Pre-fail  Always       -       0
187 Uncorrectable_Error_Cnt 0x0032   100   100   000    Old_age   Always       -       0
190 Airflow_Temperature_Cel 0x0032   067   057   000    Old_age   Always       -       33
195 ECC_Error_Rate          0x001a   200   200   000    Old_age   Always       -       0
199 CRC_Error_Count         0x003e   100   100   000    Old_age   Always       -       0
235 POR_Recovery_Count      0x0012   099   099   000    Old_age   Always       -       277
241 Total_LBAs_Written      0x0032   099   099   000    Old_age   Always       -       11878906560

¿A donde voy desde aqui?

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