Re: scsi-target and the buffer cache

2006-03-09 Thread Nate Lawson
[mailing list changed to [EMAIL PROTECTED] Eric Anderson wrote: Nate Lawson wrote: Scott Long wrote: Eric Anderson wrote: Nate Lawson wrote: Agree 100%. While having it in usermode means there are boundary crossings that increase per-transaction latency, the actual bulk data transfer is v

Re: scsi-target and the buffer cache

2006-03-08 Thread Eric Anderson
Nate Lawson wrote: Scott Long wrote: Eric Anderson wrote: Nate Lawson wrote: Agree 100%. While having it in usermode means there are boundary crossings that increase per-transaction latency, the actual bulk data transfer is via zero-copy IO and you should be able to exceed the data transfe

Re: scsi-target and the buffer cache

2005-12-08 Thread Nate Lawson
Scott Long wrote: Eric Anderson wrote: Nate Lawson wrote: Agree 100%. While having it in usermode means there are boundary crossings that increase per-transaction latency, the actual bulk data transfer is via zero-copy IO and you should be able to exceed the data transfer rates of several 1

Re: scsi-target and the buffer cache

2005-12-07 Thread Eric Anderson
Scott Long wrote: Eric Anderson wrote: Nate Lawson wrote: Scott Long wrote: Eric Anderson wrote: Nate Lawson wrote: Eric Anderson wrote: I'm curious about whether a target mode device would use the buffer cache or not. Here's a scenario: Host A: has fibre channel host adapter, in

Re: scsi-target and the buffer cache

2005-12-07 Thread Scott Long
Eric Anderson wrote: Nate Lawson wrote: Scott Long wrote: Eric Anderson wrote: Nate Lawson wrote: Eric Anderson wrote: I'm curious about whether a target mode device would use the buffer cache or not. Here's a scenario: Host A: has fibre channel host adapter, in target mode, large m

Re: scsi-target and the buffer cache

2005-12-07 Thread Eric Anderson
Nate Lawson wrote: Scott Long wrote: Eric Anderson wrote: Nate Lawson wrote: Eric Anderson wrote: I'm curious about whether a target mode device would use the buffer cache or not. Here's a scenario: Host A: has fibre channel host adapter, in target mode, large memory pool, and anothe

Re: scsi-target and the buffer cache

2005-12-07 Thread Nate Lawson
Scott Long wrote: Eric Anderson wrote: Nate Lawson wrote: Eric Anderson wrote: I'm curious about whether a target mode device would use the buffer cache or not. Here's a scenario: Host A: has fibre channel host adapter, in target mode, large memory pool, and another fiber channel host a

Re: scsi-target and the buffer cache

2005-12-07 Thread Scott Long
Eric Anderson wrote: Nate Lawson wrote: Eric Anderson wrote: I'm curious about whether a target mode device would use the buffer cache or not. Here's a scenario: Host A: has fibre channel host adapter, in target mode, large memory pool, and another fiber channel host adapter connecting to

Re: scsi-target and the buffer cache

2005-12-07 Thread Eric Anderson
Nate Lawson wrote: Eric Anderson wrote: I'm curious about whether a target mode device would use the buffer cache or not. Here's a scenario: Host A: has fibre channel host adapter, in target mode, large memory pool, and another fiber channel host adapter connecting to fibre channel block

Re: scsi-target and the buffer cache

2005-12-06 Thread Nate Lawson
Eric Anderson wrote: I'm curious about whether a target mode device would use the buffer cache or not. Here's a scenario: Host A: has fibre channel host adapter, in target mode, large memory pool, and another fiber channel host adapter connecting to fibre channel block device. Host B: Fibre

scsi-target and the buffer cache

2005-12-06 Thread Eric Anderson
I'm curious about whether a target mode device would use the buffer cache or not. Here's a scenario: Host A: has fibre channel host adapter, in target mode, large memory pool, and another fiber channel host adapter connecting to fibre channel block device. Host B: Fibre channel host adapter,