On Tue, Feb 17, 2009 at 11:35 PM, Mike Christie <micha...@cs.wisc.edu> wrote: > > Erez Zilber wrote: >> Hi, >> >> I'm running a setup of open-iscsi connected to a target. When I run >> I/O from the initiator (e.g using dd) with transaction size of 128kB, >> I sometimes see that 2 128kB requests are aggregated to a single 256kB >> request. This is rare, but it happens from time to time. Can I disable >> this feature? Who is responsible for that? Is it scsi-ml? >> > > block layer. > > /sys/block/sdX/queue/max_sectors_kb
Thanks, but this will limit the I/O size for all I/Os. What I forgot to mention is that sometimes I also send larger I/Os (e.g. 512kB). With the proposed solution, these large I/Os will be sent as multiple 128kB I/Os (and affect the performance). Isn't there a way to simply avoid this aggregation? Thanks, Erez --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "open-iscsi" group. To post to this group, send email to open-iscsi@googlegroups.com To unsubscribe from this group, send email to open-iscsi+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/open-iscsi -~----------~----~----~----~------~----~------~--~---
