Mdthbs

Generate points for smooth movement between two given points

What is the difference between "wie" and "nach" in "Klingt wie/nach..."

Does the Scrying spell require you to have a clear path to the target in order to work?

One hour 10 min layover in Newark; International -> Domestic connection. Enough time to clear customs?

What is this red bug infesting some trees in southern Germany?

Do 643,000 Americans go bankrupt every year due to medical bills?

Can I sleep overnight at Stansted Airport

How can I oppose my advisor granting gift authorship to a collaborator?

Finder/Terminal: Find files that contain less than 21 lines of text

If p-value is exactly 1 (1.0000000), what are the confidence interval limits?

Why did the Joi advertisement trigger K?

In-universe, why does Doc Brown program the time machine to go to 1955?

pruning subdomains of other domains in a file using script (bash, awk or similar)

Why would a Intel 8080 chip be destroyed if +12 V is connected before -5 V?

How do I stop making people jump at home and at work?

Visiting girlfriend in the USA

How does speed affect lift?

What does "se jouer" mean here?

Are language and thought the same?

Adding transparency to ink drawing

Everyone for non livings

How to encode a class with 24,000 categories?

Main differences between 5th edition Druid and 3.5 edition Druid

First Number to Contain Each Letter

bcache: speed optimization

Optimizing bcacheWhat exactly should we do to get bcache?SSD as a read cache for FREQUENTLY read databcache on md or md on bcacheUsing multiple SSDs as cache devices with bcache?Optimizing bcacheHow to restart a 'stopped' bcache device?How to install bcache on Linux 4.1?Bcache writeback_percent max valueReplace Bcache Backing Device

.everyoneloves__top-leaderboard:empty,.everyoneloves__mid-leaderboard:empty,.everyoneloves__bot-mid-leaderboard:empty{ margin-bottom:0;
}

0

I have read Optimizing bcache

I am trying to make this as fast as possible:

# This gives around 120 MB/s

time head -c 10G /dev/zero |pv > tmp

# Simulate that there is not 10 G RAM cache

echo 3 | sudo tee /proc/sys/vm/drop_caches

# This gives around 250 MB/s

time pv tmp >/dev/null

My 128 GB SSD has a read performance of around 350 MB/s:

sudo pv /dev/sdb >/dev/null

During writing I can see that bcache starts flushing to the backing store. So there is both reading and writing to the SSD. It would be better if it waited until there was idle time on the SSD, and only did writebehind during idle times.

There is plenty of available space on the SSD:

/sys/fs/bcache/4c957602-1e3f-48fc-9005-cb9307d7cf50/cache_available_percent:92

Is there a way I can tell bcache to optimize for the above situation? Maybe tell it to stop dealing with backing store as long as there is available space on SSD and the SSD is 100% active?

bcache

share|improve this question

asked 1 hour ago

Ole TangeOle Tange

14k1717 gold badges6161 silver badges109109 bronze badges

add a comment | 

0

I have read Optimizing bcache

I am trying to make this as fast as possible:

# This gives around 120 MB/s

time head -c 10G /dev/zero |pv > tmp

# Simulate that there is not 10 G RAM cache

echo 3 | sudo tee /proc/sys/vm/drop_caches

# This gives around 250 MB/s

time pv tmp >/dev/null

My 128 GB SSD has a read performance of around 350 MB/s:

sudo pv /dev/sdb >/dev/null

During writing I can see that bcache starts flushing to the backing store. So there is both reading and writing to the SSD. It would be better if it waited until there was idle time on the SSD, and only did writebehind during idle times.

There is plenty of available space on the SSD:

/sys/fs/bcache/4c957602-1e3f-48fc-9005-cb9307d7cf50/cache_available_percent:92

Is there a way I can tell bcache to optimize for the above situation? Maybe tell it to stop dealing with backing store as long as there is available space on SSD and the SSD is 100% active?

bcache

share|improve this question

asked 1 hour ago

Ole TangeOle Tange

14k1717 gold badges6161 silver badges109109 bronze badges

add a comment | 

I have read Optimizing bcache

I am trying to make this as fast as possible:

# This gives around 120 MB/s

time head -c 10G /dev/zero |pv > tmp

# Simulate that there is not 10 G RAM cache

echo 3 | sudo tee /proc/sys/vm/drop_caches

# This gives around 250 MB/s

time pv tmp >/dev/null

My 128 GB SSD has a read performance of around 350 MB/s:

sudo pv /dev/sdb >/dev/null

During writing I can see that bcache starts flushing to the backing store. So there is both reading and writing to the SSD. It would be better if it waited until there was idle time on the SSD, and only did writebehind during idle times.

There is plenty of available space on the SSD:

/sys/fs/bcache/4c957602-1e3f-48fc-9005-cb9307d7cf50/cache_available_percent:92

Is there a way I can tell bcache to optimize for the above situation? Maybe tell it to stop dealing with backing store as long as there is available space on SSD and the SSD is 100% active?

bcache

share|improve this question

asked 1 hour ago

Ole TangeOle Tange

14k1717 gold badges6161 silver badges109109 bronze badges

# This gives around 120 MB/s

time head -c 10G /dev/zero |pv > tmp

# Simulate that there is not 10 G RAM cache

echo 3 | sudo tee /proc/sys/vm/drop_caches

# This gives around 250 MB/s

time pv tmp >/dev/null

sudo pv /dev/sdb >/dev/null

/sys/fs/bcache/4c957602-1e3f-48fc-9005-cb9307d7cf50/cache_available_percent:92

share|improve this question

asked 1 hour ago

Ole TangeOle Tange

14k1717 gold badges6161 silver badges109109 bronze badges

share|improve this question

asked 1 hour ago

Ole TangeOle Tange

14k1717 gold badges6161 silver badges109109 bronze badges

asked 1 hour ago

Ole TangeOle Tange

14k1717 gold badges6161 silver badges109109 bronze badges

asked 1 hour ago

Ole TangeOle Tange

14k1717 gold badges6161 silver badges109109 bronze badges