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  • 0 posts edited
  • 1 helpful flag
  • 47 votes cast
Apr
13
comment Human readable memory sizes in top?
Ancient versions of top do not support command e. At least procps-ng version 3.3.9 supports it just fine.
Apr
7
awarded  Critic
Apr
7
comment How to check that a daemon is listening on what interface?
netstat -i will list interfaces, not listening ports, -1 for answer that does not reflect the reality
Mar
4
awarded  Yearling
May
9
awarded  Good Answer
Mar
17
revised How can I zoom/magnify Cinnamon desktop using the mouse wheel?
Add info about recent Cinnamon versions.
Jan
30
awarded  Yearling
Sep
30
awarded  Commentator
Sep
30
comment Can I configure my Linux system for more aggressive file system caching?
Setting vfs_cache_pressure too high (I would consider 2000 too high) will cause unnecessary disk access even for simple stuff such as directory listings which should easily fit in cache. How much RAM do you have and what are you doing with the system? As I wrote in my answer, using high value for this setting makes sense for e.g. HD video editing with limited RAM.
Sep
24
awarded  Autobiographer
Sep
18
awarded  Nice Answer
Sep
1
answered Given a kernel ATA exception, how to determine which physical disk is affected?
Apr
11
revised Poor random read SSD performance on Linux
add missing notes about SATA+AHCI+NCQ and queue_depth
Apr
11
answered Poor random read SSD performance on Linux
Apr
11
comment Can I configure my Linux system for more aggressive file system caching?
One way to improve performance a lot is to skip durability of data. Simply disable syncing to disk even if some apps requests for sync. This will cause data loss if your storage device ever suffers loss of electricity. If you want to do it anyway, simply execute sudo mount -o ro,nobarrier /path/to/mountpoint or adjust /etc/fstab to include nobarrier for any filesystem that you're willing to sacrifice for improved performance. However, if your storage device has internal battery such as Intel 320 SSD series, using nobarrier causes no data loss.
Mar
18
awarded  Citizen Patrol
Jan
3
revised Can I configure my Linux system for more aggressive file system caching?
Provide a couple of example where tuning vfs_cache_pressure makes sense, warn about unsafe config despite the fact that this config matches the original question
Oct
22
awarded  Necromancer
Aug
30
awarded  Yearling
Aug
15
comment Can I configure my Linux system for more aggressive file system caching?
@rep_movsd I've been using only intel SSD drives but at least these drives are still slow enough to have better overall performance with more intelligent schedulers such as CFQ. I'd guess that if your SSD drive can deal with more than 100K random IOPS, using noop or deadline would make sense even with fast CPU. With "fast CPU" I mean something that has at least multiple 3GHz cores available for IO only.