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disk: Improve algorithm to determine fastest transfer size

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This commit is contained in:
mintsuki 2021-08-26 01:33:43 +02:00
parent 57c44befee
commit 605623bd05
1 changed files with 15 additions and 14 deletions
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29
stage23/drivers/disk.s2.c
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@ -59,23 +59,24 @@ static size_t fastest_xfer_size(struct volume *volume) {
dap.offset = rm_off(xfer_buf);
dap.lba = 0;
struct rm_regs r = {0};
r.eax = 0x4200;
r.edx = volume->drive;
r.esi = (uint32_t)rm_off(&dap);
r.ds = rm_seg(&dap);
uint64_t start_timestamp = rdtsc();
rm_int(0x13, &r, &r);
for (size_t j = 0; j < XFER_BUF_SIZE / 512; j += xfer_sizes[i]) {
struct rm_regs r = {0};
r.eax = 0x4200;
r.edx = volume->drive;
r.esi = (uint32_t)rm_off(&dap);
r.ds = rm_seg(&dap);
rm_int(0x13, &r, &r);
if (r.eflags & EFLAGS_CF) {
int ah = (r.eax >> 8) & 0xff;
printv("Disk error %x. Drive %x", ah, volume->drive);
return 8;
}
dap.lba += xfer_sizes[i];
}
uint64_t end_timestamp = rdtsc();
if (r.eflags & EFLAGS_CF) {
int ah = (r.eax >> 8) & 0xff;
printv("Disk error %x. Drive %x", ah, volume->drive);
continue;
}
uint64_t speed = (end_timestamp - start_timestamp) / xfer_sizes[i];
uint64_t speed = end_timestamp - start_timestamp;
if (speed < last_speed) {
last_speed = speed;