Messages in this thread | | | From | Daniel Phillips <> | Subject | Re: [resent PATCH] Re: very slow parallel read performance | Date | Sun, 26 Aug 2001 23:20:24 +0200 |
| |
On August 26, 2001 10:26 pm, Gérard Roudier wrote: > On Sun, 26 Aug 2001, Daniel Phillips wrote: > > [...] > > > It should not be being ignored. This needs to be looked into. In any event, > > the max-readahead proc setting is clearly good and needs to be in Linus's > > tree, otherwise changing the default MAX_READAHEAD requires a recompile. > > Worse, there is no way at all to specify the kernel's max-readahead for scsi > > disks - regardless of the fact that scsi disks do their own readahead, the > > kernel will do its own as well, with no way for the user to turn it off. > > For SCSI disks prefetch tuning you may look into the CACHING page. > > For example, you can tell the drive to stop prefetching as soon a command > is ready by setting MINIMUM PRE-FETCH to zero. > > Unfortunately, not all SCSI disks allow to tune all the configuration > parameters of the caching page.
In this case he's using ide.
-- Daniel - 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/
| |