On Tue, Jan 09 2007, Vasily Tarasov wrote: > Jens Axboe wrote: > > Tom, you are correct, the 'B' is a bounce and not a backmerge. Vasily, > > you may want to look into your setup, bouncing is very harmful to io > > performance. > > > > > > Hello again, > > My node has 4GB RAM and by default block queue limit > is high memory boundary: > blk_queue_bounce_limit(q, BLK_BOUNCE_HIGH); > Driver doesn't set other bounce limit (like most drivers), > so I have bounces. > > Seems, that all people with more then 1GB Memory > should have such situation (except lucky beggars with "appropriate" > drivers), > am I right?
What driver do you use? By far the most common ones do support highmem IO (like IDE/SATA/SCSI, etc). -- Jens Axboe - To unsubscribe from this list: send the line "unsubscribe linux-btrace" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html
