nexoniarz/SchOS
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SchOS/kernel/dev
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Repository files (latest commit first)
Filename Latest commit message Latest commit date
Nexoniarz b213ab5778 schfs: do not read a block off the disk just to overwrite it 
kd_write() went through bread(), so every block a write allocated was
read from the disk first and then replaced whole. That was a quarter of
the disk operations of a SchFS write. bgetblk() is bread() without the
read, as Linux's getblk() is.

1 MB on AHCI under QEMU: 2.0 -> 2.8 MB/s in 4 KB writes, 4.5 -> 5.6
MB/s in 64 KB ones. 3 MB of random data written and copied through the
cache's evictions reads back with the same md5.

The 63 KB/s seen earlier is the legacy IDE driver on QEMU's default
machine, at about 10 ms per emulated PIO write; the same disk on AHCI
(q35) is 40 times faster.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01S1giNvrHTrPMPw7V6x1kQ4
2026-10-23 11:02:44 +02:00
..
audio.c audio: /dev/dsp, AudioEngine, and an AC'97 under it 2026-09-24 14:23:13 +02:00
bio.c schfs: do not read a block off the disk just to overwrite it 2026-10-23 11:02:44 +02:00
blkdev.c fs: follow symlinks like Linux; Linux mknod; /proc/partitions 2026-10-23 10:50:41 +02:00
cdev.c dev: read /dev/zero and /dev/urandom from them, not from the keyboard 2026-10-23 09:33:08 +02:00
dbg.c licence: SchOS is GPL-2.0-or-later, no longer Apache-2.0 2026-10-22 08:48:45 +02:00
device.c audio: /dev/dsp, AudioEngine, and an AC'97 under it 2026-09-24 14:23:13 +02:00
disk.c fat: FAT12, FAT16 and FAT32 with long names, read and write 2026-10-23 09:33:35 +02:00
fb.c gfx: draw the console in RAM, and write it to the card write-combined 2026-10-22 23:46:58 +02:00
gfx.c gfx: draw the console in RAM, and write it to the card write-combined 2026-10-22 23:46:58 +02:00
ide.c q35: five seconds of boot spent waiting on disks that are not there 2026-10-22 11:10:07 +02:00
input.c kernel: the clock ran 7x slow because the GPU never acknowledged its interrupt 2026-09-12 21:34:36 +02:00
irq.c acpi: uACPI, for interrupt routing, the power button and power-off 2026-10-22 16:12:28 +02:00
kbd.c kbd: three layouts, and the arrow keys were sitting on top of UTF-8 2026-09-20 01:09:32 +02:00
keymap.c kbd: three layouts, and the arrow keys were sitting on top of UTF-8 2026-09-20 01:09:32 +02:00
mouse.c boot: stop assuming the machine is an emulator 2026-10-22 10:29:12 +02:00
netuser.c licence: SchOS is GPL-2.0-or-later, no longer Apache-2.0 2026-10-22 08:48:45 +02:00
pci.c acpi: uACPI, for interrupt routing, the power button and power-off 2026-10-22 16:12:28 +02:00
pciuser.c licence: SchOS is GPL-2.0-or-later, no longer Apache-2.0 2026-10-22 08:48:45 +02:00
procfs.c fs: follow symlinks like Linux; Linux mknod; /proc/partitions 2026-10-23 10:50:41 +02:00
ramdisk.c Initial commit: Schunix as it stands before the SchOS rename 2026-08-09 13:47:01 +02:00
text.c gfx: one glyph blitter, and a terminal cell is a surface 2026-09-23 17:57:16 +02:00
ttf.c font: the console draws outlines now, and a byte could not have held Ą 2026-09-20 00:35:34 +02:00
uart.c boot: one line when it works, all of it when it does not 2026-09-14 21:19:50 +02:00
vt.c gfx: draw the console in RAM, and write it to the card write-combined 2026-10-22 23:46:58 +02:00