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file write performance drop between 2.5.60 and 2.5.70

DISCUSSION Vladimir Saveliev 5 participants 6 messages Jun 4, 2003 – Jun 5, 2003

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Vladimir Saveliev

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#0 lore raw

Hi

It looks like file write performance dropped somewhere between 2.5.60 and 2.5.70.
Doing
time dd if=/dev/zero of=file bs=4096 count=60000

on a box with Xeon(TM) CPU 2.40GHz and 1gb of RAM
I get for ext2
2.5.60: real 1.42 sys 0.77
2.5.70: real 1.73 sys 1.23
for reiserfs
2.5.60: real 1.62 sys 1.56
2.5.70: real 1.90 sys 1.86

Any ideas of what could cause this drop?

Thanks,
vs

#1 lore raw
Quoted 15 lines · Vladimir Saveliev

Hi

It looks like file write performance dropped somewhere between 2.5.60 and 2.5.70.
Doing
time dd if=/dev/zero of=file bs=4096 count=60000

on a box with Xeon(TM) CPU 2.40GHz and 1gb of RAM
I get for ext2
2.5.60: real 1.42 sys 0.77
2.5.70: real 1.73 sys 1.23
for reiserfs
2.5.60: real 1.62 sys 1.56
2.5.70: real 1.90 sys 1.86

Quoted 1 line

Any ideas of what could cause this drop?

What filesystem are you using?

#2 lore raw
Quoted 16 lines · Felipe Alfaro Solana
Quoted 15 lines · Vladimir Saveliev

Hi

It looks like file write performance dropped somewhere between 2.5.60 and 2.5.70.
Doing
time dd if=/dev/zero of=file bs=4096 count=60000

on a box with Xeon(TM) CPU 2.40GHz and 1gb of RAM
I get for ext2
2.5.60: real 1.42 sys 0.77
2.5.70: real 1.73 sys 1.23
for reiserfs
2.5.60: real 1.62 sys 1.56
2.5.70: real 1.90 sys 1.86

Quoted 3 lines
Quoted 1 line

Any ideas of what could cause this drop?

What filesystem are you using?

Good one.

ext2 and reiserfs.

Read the origional message again.

#3 lore raw
Quoted 19 lines · Mike Fedyk
Quoted 18 lines · Felipe Alfaro Solana
Quoted 16 lines · Vladimir Saveliev

Hi

It looks like file write performance dropped somewhere between 2.5.60 and 2.5.70.
Doing
time dd if=/dev/zero of=file bs=4096 count=60000

on a box with Xeon(TM) CPU 2.40GHz and 1gb of RAM
I get for ext2
2.5.60: real 1.42 sys 0.77
2.5.70: real 1.73 sys 1.23
for reiserfs
2.5.60: real 1.62 sys 1.56
2.5.70: real 1.90 sys 1.86

Any ideas of what could cause this drop?

Quoted 7 lines
Quoted 1 line

What filesystem are you using?

Good one.

ext2 and reiserfs.

Read the origional message again.

Hmmm... What filesystem was being used?
Arghh!!! I'm blind!!!!!!!

#4 lore raw

OFFTOPIC: Re: file write performance drop between 2.5.60 and 2.5.70

On Thu, Jun 05, 2003 at 09:24:15PM +0200, Felipe Alfaro Solana wrote:
[...]

Quoted 10 lines · Mike Fedyk
Quoted 8 lines · Felipe Alfaro Solana
Quoted 7 lines · Vladimir Saveliev
Quoted 6 lines

I get for ext2
2.5.60: real 1.42 sys 0.77
2.5.70: real 1.73 sys 1.23
for reiserfs
2.5.60: real 1.62 sys 1.56
2.5.70: real 1.90 sys 1.86

Quoted 2 lines

Hmmm... What filesystem was being used?
Arghh!!! I'm blind!!!!!!!

you should be going to sleep :-)

Ulisses

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#5 lore raw
In reply to Vladimir Saveliev
Quoted 16 lines · Vladimir Saveliev

Hi

It looks like file write performance dropped somewhere between 2.5.60 and 2.5.70.
Doing
time dd if=/dev/zero of=file bs=4096 count=60000

on a box with Xeon(TM) CPU 2.40GHz and 1gb of RAM
I get for ext2
2.5.60: real 1.42 sys 0.77
2.5.70: real 1.73 sys 1.23
for reiserfs
2.5.60: real 1.62 sys 1.56
2.5.70: real 1.90 sys 1.86

Quoted 2 lines

Any ideas of what could cause this drop?

hm, 2.5.60 was a long time ago. The best way to tell would be comparative oprofiling.