What does hdparm mean by “buffer cacheâ€; hardware cache in hard drive or page cache in computer memory?
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From hdparm man page:
-t Perform timings of device reads for benchmark and comparison
purposes. For meaningful results, this operation should be
repeated 2-3 times on an otherwise inactive system (no other
active processes) with at least a couple of megabytes of free
memory. This displays the speed of reading through the buffer
cache to the disk without any prior caching of data. This
measurement is an indication of how fast the drive can sustain
sequential data reads under Linux, without any filesystem
overhead. To ensure accurate measurements, the buffer cache is
flushed during the processing of -t using the BLKFLSBUF ioctl.
What is the "buffer cache"?
- The hardware cache/buffer in hard drives and in some ssd drives?
- The caching that the OS does using RAM, ie not using the cache on the harddrive. I think this is called page caching.
- Both
Maybe it's obvious for most, but it is not for me :)
hdparm
asked May 2 at 12:48
Mads Skjern
2401310
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up vote
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down vote
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From hdparm man page:
-t Perform timings of device reads for benchmark and comparison
purposes. For meaningful results, this operation should be
repeated 2-3 times on an otherwise inactive system (no other
active processes) with at least a couple of megabytes of free
memory. This displays the speed of reading through the buffer
cache to the disk without any prior caching of data. This
measurement is an indication of how fast the drive can sustain
sequential data reads under Linux, without any filesystem
overhead. To ensure accurate measurements, the buffer cache is
flushed during the processing of -t using the BLKFLSBUF ioctl.
What is the "buffer cache"?
- The hardware cache/buffer in hard drives and in some ssd drives?
- The caching that the OS does using RAM, ie not using the cache on the harddrive. I think this is called page caching.
- Both
Maybe it's obvious for most, but it is not for me :)
hdparm
asked May 2 at 12:48
Mads Skjern
2401310
add a comment |Â
up vote
2
down vote
favorite
2
up vote
2
down vote
favorite
2
2
From hdparm man page:
-t Perform timings of device reads for benchmark and comparison
purposes. For meaningful results, this operation should be
repeated 2-3 times on an otherwise inactive system (no other
active processes) with at least a couple of megabytes of free
memory. This displays the speed of reading through the buffer
cache to the disk without any prior caching of data. This
measurement is an indication of how fast the drive can sustain
sequential data reads under Linux, without any filesystem
overhead. To ensure accurate measurements, the buffer cache is
flushed during the processing of -t using the BLKFLSBUF ioctl.
What is the "buffer cache"?
- The hardware cache/buffer in hard drives and in some ssd drives?
- The caching that the OS does using RAM, ie not using the cache on the harddrive. I think this is called page caching.
- Both
Maybe it's obvious for most, but it is not for me :)
hdparm
asked May 2 at 12:48
Mads Skjern
2401310
From hdparm man page:
-t Perform timings of device reads for benchmark and comparison
purposes. For meaningful results, this operation should be
repeated 2-3 times on an otherwise inactive system (no other
active processes) with at least a couple of megabytes of free
memory. This displays the speed of reading through the buffer
cache to the disk without any prior caching of data. This
measurement is an indication of how fast the drive can sustain
sequential data reads under Linux, without any filesystem
overhead. To ensure accurate measurements, the buffer cache is
flushed during the processing of -t using the BLKFLSBUF ioctl.
What is the "buffer cache"?
- The hardware cache/buffer in hard drives and in some ssd drives?
- The caching that the OS does using RAM, ie not using the cache on the harddrive. I think this is called page caching.
- Both
Maybe it's obvious for most, but it is not for me :)
hdparm
asked May 2 at 12:48
Mads Skjern
2401310
asked May 2 at 12:48
Mads Skjern
2401310
asked May 2 at 12:48
Mads Skjern
2401310
asked May 2 at 12:48
Mads Skjern
2401310
2401310
add a comment |Â
add a comment |Â
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