[lkml]   [2000]   [Dec]   [27]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
SubjectRe: cdrom changes in test13-pre2 slow down cdrom access by 70%
Jens Axboe wrote:
> In principle it looks ok, but after some time we are bound to fail 8
> frame allocations anyway and this patch won't help. For the modular
> case, preallocation of a bigger chunk at init time is no good either.
> Builtin would be fine of course. This almost screams sg to me :-)

Nonetheless, with your first patch and my patch, the system starts off
using the old method of trying to allocate 8 frames buffer (which is
essential for performance) and falls back to the current (as of
test13-pre2) way in low/fragmented memory situations. To me, that's
better than either the previous or the current method, with the slight
increased cost of the failed kmalloc every time in the low/fragmented
memory case. BTW, have you gotten reports of that kmalloc failing for
people? I've been ripping audio with every kernel since pre4 and have
never had a failure. Granted, I put 'workstation' loads on my machine,
but I run some benchmarks from time-to-time, put memory pressure on
etc. (H*ll, just netscape alone is memory pressure enough :-).

I just don't want to have to patch every kernel I run from here to
eternity. Call me selfish.


David Mansfield (718) 963-2020
Ultramaster Group, LLC
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to
Please read the FAQ at

 \ /
  Last update: 2005-03-22 12:52    [from the cache]
©2003-2014 Jasper Spaans. hosted at Digital Ocean