Re: Chaining sg lists for big I/O commands: Question

2007-05-10 Thread Jens Axboe
On Thu, May 10 2007, Jan Engelhardt wrote: > On May 9 2007 15:38, Jens Axboe wrote: > >> I am a mdadm/disk/hard drive fanatic, I was curious: > >> > >> >On i386, we can at most fit 256 scatterlist elements into a page, > >> >and on x86-64 we are stuck with 128. So that puts us somewhere > >> >betw

Re: Chaining sg lists for big I/O commands: Question

2007-05-10 Thread Jan Engelhardt
On May 9 2007 15:38, Jens Axboe wrote: >> I am a mdadm/disk/hard drive fanatic, I was curious: >> >> >On i386, we can at most fit 256 scatterlist elements into a page, >> >and on x86-64 we are stuck with 128. So that puts us somewhere >> >between 512kb and 1024kb for a single IO. >> >> How come 3

Re: Chaining sg lists for big I/O commands: Question

2007-05-09 Thread Jens Axboe
On Wed, May 09 2007, Justin Piszcz wrote: > http://kerneltrap.org/node/8176 Oh > I am a mdadm/disk/hard drive fanatic, I was curious: > > >On i386, we can at most fit 256 scatterlist elements into a page, > >and on x86-64 we are stuck with 128. So that puts us somewhere > >between 512kb and 1024