![]() | |||||||||||||
Messages in this thread |
Quote from Giuliano Pochini <pochini@shiny.it>: > > On 12-Feb-2004 Andrea Arcangeli wrote:> > > the main difference is that 2.4 isn't in function of time, it's in > > function of requests, no matter how long it takes to write a request, > > so it's potentially optimizing slow devices when you don't care about > > latency (deadline can be tuned for each dev via> > /sys/block/*/queue/iosched/).> > IMHO it's the opposite. Transfer speed * seek time of some > slow devices is lower than fast devices. For example: > > Hard disk raw speed= 40MB/s seek time = 8ms> MO/ZIP raw speed= 3MB/s seek time = 25ms> > One seek of HD costs about 320KB, while on a slow drive it's > only 75KB. Hmmm, but I would imagine that most hard disks have much larger caches than are popular on removable cartridge drives... John. - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/ | ||||||||||||
| Last update: 2005-03-22 13:00 [from the cache] ©2003-2008 | |||||||||||||