Messages in this thread | | | Date | Fri, 21 Dec 2001 23:19:51 +0100 | From | Jens Axboe <> | Subject | Re: 2.5.2-pre1 dbench 32 hangs in vmstat "b" state |
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On Fri, Dec 21 2001, rwhron@earthlink.net wrote: > On Fri, Dec 21, 2001 at 06:01:56PM +0100, Jens Axboe wrote: > > Thanks -- could you also try and do sysrq-t back traces when it seems > > stuck? > > > > Does a non-highmem kernel run ok? > > > > -- > > Jens Axboe > > I recompiled with highmem turned off. > # CONFIG_HIGHMEM4G is not set > # CONFIG_HIGHMEM64G is not set > > I run a scripty that executes dbench 32, then dbench 128.
Ok, please try something for me. In drivers/block/elevator.c, comment out this block:
if (q->last_merge) { __rq = list_entry_rq(q->last_merge); BUG_ON(__rq->flags & REQ_STARTED);
if ((ret = elv_try_merge(__rq, bio))) { *req = __rq; return ret; } }
(just #if 0 the entire thing) -- the one inside elevator_linus_merge()
Loop back highmem issue is different, I'll take a look at that later. I'll be pretty unresponsive over christmas, though.
-- Jens Axboe
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