From: Stefan Holst <mail@s-holst.de>
To: sparclinux@vger.kernel.org
Subject: srmmu_nocache_calcsize with low memory
Date: Sun, 21 Mar 2004 15:50:52 +0000 [thread overview]
Message-ID: <20040321155052.GA10374@spike> (raw)
hello,
there is a problem in 2.6.4/5 according the amount of system ram
reserved on machines with very low memory (e.g. leon systems ;)).
in void srmmu_nocache_calcsize(void) there is a hardcoded minimum size
for srmmu_nocache_npages of currently 550:
srmmu_nocache_npages sysmemavail / SRMMU_NOCACHE_ALCRATIO / 1024 * 256;
/* P3 XXX The 4x overuse: corroborated by /proc/meminfo. */
// if (srmmu_nocache_npages < 256) srmmu_nocache_npages = 256;
if (srmmu_nocache_npages < SRMMU_MIN_NOCACHE_PAGES)
srmmu_nocache_npages = SRMMU_MIN_NOCACHE_PAGES;
i didn't really understand the comment - what is the matter with that?
after deactivating this minimum enforcement, my 4mb-system doesn't work
either; the calculated value (16) seems to be much too low. i did some
testing and found, that the system starts fine from a value around 27:
srmmu_nocache_npages = 27:
/ # cat proc/meminfo
MemTotal: 2648 kB
MemFree: 1344 kB
Buffers: 396 kB
Cached: 380 kB
SwapCached: 0 kB
Active: 756 kB
Inactive: 148 kB
HighTotal: 0 kB
HighFree: 0 kB
LowTotal: 2648 kB
LowFree: 1344 kB
SwapTotal: 0 kB
SwapFree: 0 kB
Dirty: 0 kB
Writeback: 0 kB
Mapped: 388 kB
Slab: 432 kB
Committed_AS: 252 kB
PageTables: 24 kB
VmallocTotal: 25600 kB
VmallocUsed: 0 kB
VmallocChunk: 25600 kB
with a value of 350, the system begins to run out of memory while
loading busybox (it gets very slow):
srmmu_nocache_npages = 350:
/ # cat proc/meminfo
MemTotal: 1356 kB
MemFree: 344 kB
Buffers: 396 kB
Cached: 84 kB
SwapCached: 0 kB
Active: 516 kB
Inactive: 128 kB
HighTotal: 0 kB
HighFree: 0 kB
LowTotal: 1356 kB
LowFree: 344 kB
SwapTotal: 0 kB
SwapFree: 0 kB
Dirty: 0 kB
Writeback: 0 kB
Mapped: 196 kB
Slab: 432 kB
Committed_AS: 252 kB
PageTables: 24 kB
VmallocTotal: 25600 kB
VmallocUsed: 0 kB
VmallocChunk: 25600 kB
srmmu_nocache_calcsize should be fixed for low memory. but how? any
suggestions?
--
RY Stefan
+-----------------+----------------+
| mail@s-holst.de | www.s-holst.de |
+-----------------+----------------+
next reply other threads:[~2004-03-21 15:50 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-03-21 15:50 Stefan Holst [this message]
2004-03-21 17:53 ` srmmu_nocache_calcsize with low memory Keith M Wesolowski
2004-03-21 18:44 ` Stefan Holst
2004-03-22 0:35 ` Keith M Wesolowski
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