Messages in this thread Patch in this message |  | | Subject | Re: mmap()/VM problems in 2.4.0 | | From | Zlatko Calusic <> | | Date | 15 Jan 2001 21:31:56 +0100 |
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"Vlad Bolkhovitine" <vladb@sw.com.sg> writes:
> Here is updated info for 2.4.1pre3: > > Size is MB, BlkSz is Bytes, Read, Write, and Seeks are MB/sec > > with mmap() > > File Block Num Seq Read Rand Read Seq Write Rand Write > Dir Size Size Thr Rate (CPU%) Rate (CPU%) Rate (CPU%) Rate (CPU%) > ------- ------ ------- --- ----------- ----------- ----------- ----------- > . 1024 4096 2 1.089 1.24% 0.235 0.45% 1.118 4.11% 0.616 1.41% > > without mmap() > > File Block Num Seq Read Rand Read Seq Write Rand Write > Dir Size Size Thr Rate (CPU%) Rate (CPU%) Rate (CPU%) Rate (CPU%) > ------- ------ ------- --- ----------- ----------- ----------- ----------- > . 1024 4096 2 28.41 41.0% 0.547 1.15% 13.16 16.1% 0.652 1.46% > > > Mmap() performance dropped dramatically down to almost unusable level. Plus, > system was unusable during test: "vmstat 1" updated results every 1-2 _MINUTES_! >
You need Marcelo's patch. Please apply and retest.
--- linux.orig/mm/vmscan.c Mon Jan 15 02:33:15 2001 +++ linux/mm/vmscan.c Mon Jan 15 02:46:25 2001 @@ -153,7 +153,7 @@
if (VALID_PAGE(page) && !PageReserved(page)) { try_to_swap_out(mm, vma, address, pte, page); - if (--count) + if (!--count) break; } }
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