Ursula,
Any chance the requirement for contiguous memory in vmcp could be relaxed?
In my test case, 'Q DA DETAILS 0-FFFF' requires ~2.5 MB and, as I
understand it, that output can simply not be obtained through vmcp.
Thanks.
-Mike MacIsaac
On Mon, Jul 13, 2015 at 10:28 AM, Ursula Braun <ubr...@linux.vnet.ibm.com>
wrote:
> Tomas,
>
> the qeth driver has been improved in 2014 to reduce its demand for
> contiguous storage:
>
> http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/drivers/s390/net/qeth_core.h?id=d445a4e28c0ff740e946ae22860be85428814c39
>
> Regards, Ursula Braun, IBM Germany, Linux on System z Dev.
>
> On Mon, 2015-07-13 at 13:39 +0000, Pavelka, Tomas wrote:
> > > I wouldn't really put that at the feet of s390 (z/Architecture).
> >
> > Bad wording on my part. When I said s390 I meant the s390 part of the
> Linux kernel implementation, not the entire architecture. I meant to point
> out that the other parts of the kernel are working on getting out of the
> requirement of large contiguous buffers. AFAIK the vmcp driver uses the
> largest buffer and as you say, if the diag allowed to return discontiguous
> memory then it would solve the fragmentation problem. There are few other
> places that used larger buffers, NIC driver was one of them. So not sure if
> "all over" was the good wording either, maybe I should have said "multiple
> places" ;-)
> >
> > Tomas
> >
> > ----------------------------------------------------------------------
> > For LINUX-390 subscribe / signoff / archive access instructions,
> > send email to lists...@vm.marist.edu with the message: INFO LINUX-390
> or visit
> > http://www.marist.edu/htbin/wlvindex?LINUX-390
> > ----------------------------------------------------------------------
> > For more information on Linux on System z, visit
> > http://wiki.linuxvm.org/
> >
>
> ----------------------------------------------------------------------
> For LINUX-390 subscribe / signoff / archive access instructions,
> send email to lists...@vm.marist.edu with the message: INFO LINUX-390 or
> visit
> http://www.marist.edu/htbin/wlvindex?LINUX-390
> ----------------------------------------------------------------------
> For more information on Linux on System z, visit
> http://wiki.linuxvm.org/
>
----------------------------------------------------------------------
For LINUX-390 subscribe / signoff / archive access instructions,
send email to lists...@vm.marist.edu with the message: INFO LINUX-390 or visit
http://www.marist.edu/htbin/wlvindex?LINUX-390
----------------------------------------------------------------------
For more information on Linux on System z, visit
http://wiki.linuxvm.org/
