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nova: make write-combined unit test more robust

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- touch all memory before time measurements, to reduce lazy paging jitter
- diff of 100us between 2 memset runs are now considered a failure (before 10us)
- add refrence measurements of same region size which is not write-combined
- make the output easier parse able of write-combined test

Fixes #5342
This commit is contained in:
Alexander Boettcher 2024-09-18 09:55:47 +02:00 committed by Christian Helmuth
parent 09461c51bd
commit 4554ec42da
1 changed files with 40 additions and 31 deletions
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71
repos/base-nova/src/test/nova/main.cc
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@ -297,27 +297,27 @@ void test_pat(Genode::Env &env)
Xml_node const hardware = platform_info.xml().sub_node("hardware");
uint64_t const tsc_freq = hardware.sub_node("tsc").attribute_value("freq_khz", 1ULL);
enum { DS_ORDER = 12, PAGE_4K = 12 };
enum { DS_ORDER = 12, PAGE_4K = 12, DS_SIZE = 1ul << (DS_ORDER + PAGE_4K) };
Attached_dataspace ds { env.rm(), env.ram().alloc (1 << (DS_ORDER + PAGE_4K),
WRITE_COMBINED) };
addr_t const map_addr = addr_t(ds.local_addr<void>());
Genode::Rm_connection rm(env);
Genode::Region_map_client rm_unused(rm.create(DS_SIZE));
enum { STACK_SIZE = 4096 };
Attached_dataspace ds_wc { env.rm(), env.ram().alloc (DS_SIZE, WRITE_COMBINED) };
Attached_dataspace ds { env.rm(), env.ram().alloc (DS_SIZE) };
Attached_dataspace remap { env.rm(), rm_unused.dataspace() };
static Rpc_entrypoint ep(&env.pd(), STACK_SIZE, "rpc_ep_pat",
auto const memory = addr_t(ds .local_addr<void>());
auto const memory_wc = addr_t(ds_wc.local_addr<void>());
auto const memory_remap = addr_t(remap.local_addr<void>());
static Rpc_entrypoint ep(&env.pd(), 4096 /* STACK */, "rpc_ep_pat",
Affinity::Location());
Genode::Rm_connection rm(env);
Genode::Region_map_client rm_free_area(rm.create(1 << (DS_ORDER + PAGE_4K)));
Attached_dataspace remap { env.rm(), rm_free_area.dataspace() };
addr_t const remap_addr = addr_t(remap.local_addr<void>());
/* trigger mapping of whole area */
for (addr_t i = map_addr; i < map_addr + (1 << (DS_ORDER + PAGE_4K)); i += (1 << PAGE_4K))
touch_read(reinterpret_cast<unsigned char *>(map_addr));
for (auto offset = 0; offset < DS_SIZE; offset += (1u << PAGE_4K)) {
touch_read_write(reinterpret_cast<unsigned char *>(memory_wc + offset));
touch_read_write(reinterpret_cast<unsigned char *>( memory + offset));
}
/*
* Establish memory mapping with evilly wrong mapping attributes
@ -331,8 +331,8 @@ void test_pat(Genode::Env &env)
native_pd.alloc_rpc_cap(thread_cap, (addr_t)portal_entry, 0 /* MTD */);
Nova::Rights const all(true, true, true);
Nova::Mem_crd const rcv_crd(remap_addr >> PAGE_4K, DS_ORDER, all);
Nova::Mem_crd const snd_crd(map_addr >> PAGE_4K, DS_ORDER, all);
Nova::Mem_crd const rcv_crd(memory_remap >> PAGE_4K, DS_ORDER, all);
Nova::Mem_crd const snd_crd(memory_wc >> PAGE_4K, DS_ORDER, all);
Nova::Crd const old_crd = utcb.crd_rcv;
utcb.crd_rcv = rcv_crd;
@ -348,36 +348,45 @@ void test_pat(Genode::Env &env)
}
/* sanity check - touch re-mapped area */
for (addr_t i = remap_addr; i < remap_addr + (1 << (DS_ORDER + PAGE_4K)); i += (1 << PAGE_4K))
touch_read(reinterpret_cast<unsigned char *>(remap_addr));
for (auto offset = 0; offset < DS_SIZE; offset += (1 << PAGE_4K))
touch_read_write(reinterpret_cast<unsigned char *>(memory_remap + offset));
/*
* measure time to write to the memory
*/
memset(reinterpret_cast<void *>(map_addr), 0, 1 << (DS_ORDER + PAGE_4K));
memset(reinterpret_cast<void *>(memory), 0, DS_SIZE);
Trace::Timestamp normal_start = Trace::timestamp();
memset(reinterpret_cast<void *>(memory), 0, DS_SIZE);
Trace::Timestamp normal_end = Trace::timestamp();
memset(reinterpret_cast<void *>(memory_wc), 0, DS_SIZE);
Trace::Timestamp map_start = Trace::timestamp();
memset(reinterpret_cast<void *>(map_addr), 0, 1 << (DS_ORDER + PAGE_4K));
memset(reinterpret_cast<void *>(memory_wc), 0, DS_SIZE);
Trace::Timestamp map_end = Trace::timestamp();
memset(reinterpret_cast<void *>(remap_addr), 0, 1 << (DS_ORDER + PAGE_4K));
memset(reinterpret_cast<void *>(memory_remap), 0, DS_SIZE);
Trace::Timestamp remap_start = Trace::timestamp();
memset(reinterpret_cast<void *>(remap_addr), 0, 1 << (DS_ORDER + PAGE_4K));
memset(reinterpret_cast<void *>(memory_remap), 0, DS_SIZE);
Trace::Timestamp remap_end = Trace::timestamp();
Trace::Timestamp map_run = map_end - map_start;
Trace::Timestamp remap_run = remap_end - remap_start;
auto normal_run = normal_end - normal_start;
auto map_run = map_end - map_start;
auto remap_run = remap_end - remap_start;
Trace::Timestamp diff_run = map_run > remap_run ? map_run - remap_run : remap_run - map_run;
auto diff_run = map_run > remap_run ? map_run - remap_run : remap_run - map_run;
if (check_pat && diff_run * 100 / tsc_freq) {
log("memory non writecombined ", normal_run * 1000 / tsc_freq, " us");
log("memory writecombined ", map_run * 1000 / tsc_freq, " us");
log("memory writecombined remapped ", remap_run * 1000 / tsc_freq, " us");
log("variance writecombined tests ", diff_run * 1000 / tsc_freq, " us");
if (check_pat && diff_run * 10 / tsc_freq) {
failed ++;
error("map=", Hex(map_run), " remap=", Hex(remap_run), " --> "
"diff=", Hex(diff_run), " freq_tsc=", tsc_freq, " ",
diff_run * 1000 / tsc_freq, " us");
error("PAT test considered failed - time difference above 100us");
}
Nova::revoke(Nova::Mem_crd(remap_addr >> PAGE_4K, DS_ORDER, all));
Nova::revoke(Nova::Mem_crd(memory_remap >> PAGE_4K, DS_ORDER, all));
}
void test_server_oom(Genode::Env &env)