Wrong checksumming function chosen
Hi!
It seems as my computer (Athlon XP 2000+) chooses the wrong checksumming function.
The kernel output is as follows:
raid5: measuring checksumming speed
8regs : 2564.000 MB/sec 32regs : 2260.000 MB/sec pIII_sse : 4748.400 MB/sec pII_mmx : 3921.200 MB/sec p5_mmx : 5022.400 MB/sec
raid5: using function: pIII_sse (4748.400 MB/sec)
I hope I can help the developers with this piece of information. And I also hope I mailed at the right address.
Greets,
Signature · 6 lines
Sebastian Schäfer E-Mail: [email protected] || http://www.uliweb.de - To unsubscribe from this list: send the line "unsubscribe linux-raid" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
Quoted 13 lines · On Sunday September 22, [email protected] wrote:
Hi!
It seems as my computer (Athlon XP 2000+) chooses the wrong checksumming function.
The kernel output is as follows:
raid5: measuring checksumming speed
8regs : 2564.000 MB/sec 32regs : 2260.000 MB/sec pIII_sse : 4748.400 MB/sec pII_mmx : 3921.200 MB/sec p5_mmx : 5022.400 MB/sec
Quoted 4 lines
raid5: using function:
pIII_sse(4748.400 MB/sec)I hope I can help the developers with this piece of information. And I also hope I mailed at the right address.
The only problem here is that the message is misleading.
pIII_sse is deliberately chosen despite appearing not to be so fast because it avoid the level-1 cache which is appropriate for this data which is only used by the CPU once.
NeilBrown
Quoted 9 lines
Greets,
Signature · 6 lines
Sebastian Schäfer E-Mail: [email protected] || http://www.uliweb.de - To unsubscribe from this list: send the line "unsubscribe linux-raid" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
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