Messages in this thread | | | From | Badari Pulavarty <> | Subject | Re: mounting 4000 disks | Date | Thu, 3 Apr 2003 16:19:01 -0800 |
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On Thursday 03 April 2003 03:43 pm, Andrew Morton wrote: > Badari Pulavarty <pbadari@us.ibm.com> wrote: > > Hi, > > > > I have been playing with testing 4000 disk support. (using 32bit dev_t). > > > > I created 4000 disks using scsi_debug and mounted them. > > We consumed 84MB of low memory by just mouting 4000 filesystems. > > Out of 84MB lowmem 48MB is in slabs. 33 MB is used by buffers. > > 20 kbytes per disk+filesystem seems reasonable. > > The "Buffers" will be the superblock (4k) and the group descriptor blocks > (256 bytes per gigabyte of disk). These are pinned memory. > > And the ext2 superblock got bigger in -mm due to the recent scalability > patches. > > What is using the "size-8192" allocation there? It could be the ext2 > superblock if you have NR_CPUS=32.
I think so..
Apr 3 17:21:46 elm3b78 kernel: [<c013f71b>] kmalloc+0x5b/0x1d0 Apr 3 17:21:46 elm3b78 kernel: [<c0208d62>] vsnprintf+0x2a2/0x430 Apr 3 17:21:46 elm3b78 kernel: [<c01aae3b>] ext2_fill_super+0x2b/0x8f0 Apr 3 17:21:46 elm3b78 kernel: [<c0208f09>] snprintf+0x19/0x20 Apr 3 17:21:46 elm3b78 kernel: [<c025ad88>] __bdevname+0xc8/0x110 Apr 3 17:21:46 elm3b78 kernel: [<c015cd60>] get_sb_bdev+0xe0/0x130 Apr 3 17:21:46 elm3b78 kernel: [<c0172579>] alloc_vfsmnt+0x79/0xb0 Apr 3 17:21:46 elm3b78 kernel: [<c016330e>] real_lookup+0x5e/0xd0 Apr 3 17:21:46 elm3b78 kernel: [<c01aba8e>] ext2_get_sb+0x1e/0x30 Apr 3 17:21:46 elm3b78 kernel: [<c01aae10>] ext2_fill_super+0x0/0x8f0 Apr 3 17:21:46 elm3b78 kernel: [<c015cf34>] do_kern_mount+0x44/0xc0 Apr 3 17:21:46 elm3b78 kernel: [<c0173ba9>] do_add_mount+0x79/0x170 Apr 3 17:21:46 elm3b78 kernel: [<c0109d8d>] error_code+0x2d/0x38 Apr 3 17:21:46 elm3b78 kernel: [<c0173ebb>] do_mount+0x14b/0x170 Apr 3 17:21:46 elm3b78 kernel: [<c0173d13>] copy_mount_options+0x73/0xd0 Apr 3 17:21:46 elm3b78 kernel: [<c017455d>] sys_mount+0xed/0x180 Apr 3 17:21:46 elm3b78 kernel: [<c0109303>] syscall_call+0x7/0xb
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